Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea898a81a3b18cd…

MALICIOUS

PDF

76.8 KB Created: 2021-05-07 02:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7a58901ac7bb52ad1c7ebcfad21b8472 SHA-1: 637a24fd83170d6f2c660c9145d7dbf7e546c61a SHA-256: aea898a81a3b18cd56983e94b54c94edd8f5f699d9717b022d13fe05c90c6952
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a primary focus on redirecting users to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to exploit users by presenting deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/strik?utm_term=sample+interview+questions+and+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477163/normal_6064bcc970907.pdfIn PDF document text
    • https://futinubub.weebly.com/uploads/1/3/5/3/135328842/fc0d4d66dfd78c.pdfIn PDF document text
    • https://zuberexuwaxif.weebly.com/uploads/1/3/4/5/134501439/lafiv-zukibenun-pemikoju-lidiragad.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebapenuj/iaAQZG7/twitch_video_player_banner_template.pdfIn PDF document text
    • https://vozozexofevufut.weebly.com/uploads/1/3/1/8/131871902/3027802.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/aK7wgU1/fantastic_fishing_mod_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495241/normal_60128cdeeff3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372074/normal_60279e8033579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_602452dca1804.pdfIn PDF document text
    • https://cdn.sqhk.co/motuxeneb/khdSULX/29726008836.pdfIn PDF document text
    • https://taxefijiduru.weebly.com/uploads/1/3/5/3/135311915/foxifi-dagagivom-roniduna.pdfIn PDF document text
    • https://dozowogan.weebly.com/uploads/1/3/4/0/134098910/1496277.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/bnCPoQK/supasagafukukekafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuzebelinebofe.epizy.com/asme_pcc_1_appendix_d.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/surf_report_bunker_bay_wa.pdfIn PDF document text
    • http://gukasitaxe.epizy.com/alfa_romeo_giulietta_2016_brochure.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/bijalitewijedarosisid.pdfIn PDF document text
    • http://xajerowufiboreb.epizy.com/list_of_non_manual_markers_in_asl.pdfIn PDF document text
    • http://dexifugufesi.epizy.com/bookkeeper_job_description.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c40e73ee-695b-4152-964f-8ffaf3c9f83a/fasojanenejetefegu.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/how_to_start_craftsman_snowblower_without_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a17b7b-89d7-4ead-a915-563171ff1fce/difference_between_rt-ac68u_and_rt-ac86u.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d172fd1-244d-485b-948a-6767058af100/85631863719.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 5488 bytes
SHA-256: 2e975cf329a5e03ade9e611fb9962ff4a08b7a906517b58507200002830b74d0
font_01_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 10452 bytes
SHA-256: 87138dff596caac17d63081cb28edfe9988f42a234c7e890ee91345267658039

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