Malicious PDF — malware analysis report

Static analysis result for SHA-256 4849e41672c3e145…

MALICIOUS

PDF

133.6 KB Created: 2021-04-17 23:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a9818491b4801359ac760da08f202165 SHA-1: e1d7fdb1ae440ef03ccea2236dc8f5ef5cd5b8f8 SHA-256: 4849e41672c3e1456faae6e6ad6d79b348cbccfaefc57404864eecc96dd1f289
316 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF document exhibits multiple indicators of malicious intent, including impersonating Apple to trick users into installing a browser extension, which is a common tactic for credential theft and malware delivery. It also contains numerous links to SEO spam pages, suggesting a broader campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/d0f002.pdf.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/strik?utm_term=samsung+sdr-5100n+default+password PDF link annotation
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/d0f002.pdfIn PDF document text
    • https://pebabole.weebly.com/uploads/1/3/4/6/134698512/8731478.pdfIn PDF document text
    • https://sofotegepure.weebly.com/uploads/1/3/4/5/134522016/gakedabuxuwe.pdfIn PDF document text
    • https://seduzitatadobi.weebly.com/uploads/1/3/4/3/134371103/sizopofumuradolu.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_7596d303746244229a16e4647584595b.pdf?index=trueIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_d2c8437b0a244c72aa9fc996b2a5b904.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/varolexexus/56623644813.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/words_their_way_online_access.pdfIn PDF document text
    • https://0315d410-4255-45a3-9477-873949dd02ac.filesusr.com/ugd/f85006_dbba38b694424e00a2768ae863d69d73.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_fe46cc8de53c43a39a0b6e36584dd5f4.pdf?index=trueIn PDF document text
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_b1493d8aec2c45eaa9bc7643e4571a79.pdf?index=trueIn PDF document text
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_c7f5af1d5ddf4ec2b82508136d8ab2a2.pdf?index=trueIn PDF document text
    • https://13006a6e-9b3f-4191-9e3f-064114488741.filesusr.com/ugd/34464a_af372b98cff24dd5a3f0ba4bbec29433.pdf?index=trueIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_e0b809a6e4a74a2dad5c98d9cb57451a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/best_chat_apps_for_android_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/is_it_wrong_to_pick_up_a_girl_in_a_dungeon_light_novel_volume_1.pdfIn PDF document text
    • https://79f67b98-100a-41ac-8a2f-4880133f117e.filesusr.com/ugd/f12c90_23697421cc4b41d2b10d3756cd4105c4.pdf?index=trueIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_62a78683ec4e4e85813175529fbdf22d.pdf?index=trueIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_c185ced2a2aa45148bb0296621106f3f.pdf?index=trueIn PDF document text
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_3096ba8297fe485cbbd006605d0ad13c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/matthew_17_esv.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/jebanubuli.pdfIn PDF document text
    • https://a35b4eae-300a-44a5-b982-8d633984e519.filesusr.com/ugd/19735e_0ee9b2cc672447199ab0fadb85358aa3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/35494790610.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB91 2908 bytes
SHA-256: 6c29a3dd7be7c27db617f4cd048284b6e249a91c8ff5d6b0c6f76cb1f0f313c4
font_01_sfnt_off0001c7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7B4 5908 bytes
SHA-256: 99ad9bf7713a18df6ba8a016aba0110e250a0a4dc3ea447cbb46404e0e00dd31
font_02_sfnt_off0001dbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBD5 12920 bytes
SHA-256: b3996878a696ab970a2e64e3b2d7ecc8046cff840860e847fdaa88dfc76f8e7b

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