Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbc7da847cd194c…

MALICIOUS

PDF

69.8 KB Created: 2020-11-14 19:48:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: dfe94f181d8bb55ca65afc21734e3a53 SHA-1: 8d19ca310e3aee2e490520a0c2eac4230f755857 SHA-256: 0cbc7da847cd194c8b0341f2b105e49822e77f01dd2c08ddbde7c79f08aa017c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing sites, with one URL specifically mentioning 'worksheet answer key' to entice clicks. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a malicious site or download further payloads. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafftec.ru/123?utm_term=population+genetics+and+speciation+worksheet+answer+key PDF link annotation
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/ffc40040a9e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_5fa58ccac7dc8.pdfIn PDF document text
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/8980381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_5f90b38628724.pdfIn PDF document text
    • https://naxujurimarawe.weebly.com/uploads/1/3/4/6/134640244/sogijepami.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gozilum/bluetooth_transmitter_for_pc_and_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c621fdcb-c868-4998-b756-29e4d40729f6/65199946527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d88b1b-1254-4849-902c-7db6a358223c/download_apk_snaptube_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44c4efbd-c7d1-400c-b4cf-ce01073b6438/apb_reloaded_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/denefukazaxexot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77b235bd-f968-4d12-af7f-bb25641ae955/kedewomowesaki.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_off0000c6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FF 5476 bytes
SHA-256: 441a23ce0ac75b504e33ef0770768e0d3ceba435be69591ad1a0e177429f732c
font_01_sfnt_off0000d9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 10108 bytes
SHA-256: d6eee2dfcd8105fdf95f55cc30e5bb30a30d83e3cf86330a161f1c3d5e8d623c
font_02_sfnt_off0000fc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC36 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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