Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe173749da7128c…

MALICIOUS

PDF

77.2 KB Created: 2021-04-18 11:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7889867d3fa0d16cc840cd9cffca7d47 SHA-1: d0f90b525228594430cd67d61636e5b36af649fc SHA-256: 0fe173749da7128c2b0991cdb3ac8333707a1180d5011b1a2425ca2d910dbeb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The presence of a large number of external links, specifically noted as a 'PDF_SEO_LINK_FARM', suggests a phishing or malicious redirection attempt. The embedded URL 'https://pelibifir.ru/strik?utm_term=can+you+have+proper+nouns+in+scrabble' is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=can+you+have+proper+nouns+in+scrabble
    • https://static.s123-cdn-static.com/uploads/4475382/normal_600662ada5692.pdf
    • https://cdn.sqhk.co/fujotojaxob/jhgg736/21853589593.pdf
    • http://lnstagramsupportinfo.com/45492913728weaky.pdf
    • https://cdn.sqhk.co/lojenozasila/bGRj6hj/square_mirror_cake_stand.pdf
    • https://cdn-cms.f-static.net/uploads/4444117/normal_601bcacf1ba46.pdf
    • https://cdn.sqhk.co/bepifopid/dhbhbQB/human_resource_management_journal_articles.pdf
    • http://lynciguest.com/578417880300dd6s.pdf
    • https://cdn.sqhk.co/vegubefeno/ctgeM8g/75393712408.pdf
    • https://cdn.sqhk.co/zuzudumijamo/ynx4hhQ/vevafadenotozisuzojaxewu.pdf
    • https://cdn-cms.f-static.net/uploads/4374843/normal_6036c21f2d942.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_af731f6cff5b4768a9e36858ba6879f6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/07c33d65-6594-4154-a9f7-3a7065b9620d/dell_latitude_e6430_i5-3320m_specs.pdf
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_2aa05c9b877147408591da7e18f6a32a.pdf?index=true
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_cf731f3bef504192abf38d4563c70a0a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c8ac9450-a757-4893-9f5d-87fe43a39f3a/how_much_is_a_stryker_stretcher.pdf
    • https://uploads.strikinglycdn.com/files/60c0500b-b86d-4af9-8070-68f91a467dda/whirlpool_washing_machine_manual_top_load.pdf
    • https://a539eca0-ed6d-4e39-a9fd-63162facd464.filesusr.com/ugd/8170ee_a7c929b78de948e49eb99be8ada84e88.pdf?index=true
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_4c49fd81c79a4683808bf7e8d649c876.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c4880acb-6af6-4a4d-9a8a-d2442bc0a218/three_a_light_download_free.pdf
    • https://uploads.strikinglycdn.com/files/3bf7b3a8-c40d-4445-9b09-663d4f7948a3/zevafigudawibusilibezim.pdf
    • https://uploads.strikinglycdn.com/files/9171e34b-379d-4425-9807-521f073ae6a2/gekugewusadi.pdf
    • https://uploads.strikinglycdn.com/files/1694c24e-ee6f-4a1a-b1e0-5fe6c81f9e4f/bujidarorumifufiw.pdf
    • https://uploads.strikinglycdn.com/files/62c10be0-3a82-40d3-b4f2-9c6e4cb9d60a/how_to_increase_male_sex_drive_after_50.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f065.bin
73e7af53e60e377f2d570d5e40ae2ceb3a3fbe2c37cbeee5e75a150be5928145		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 5228 bytes
font_01_sfnt_off0001022e.bin
8868ae753939da871b75442f2afbf015ca9bcbba21526885e3f863135dfd85d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 11140 bytes

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