Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc7a21eb00453c3c…

MALICIOUS

PDF

79.5 KB Created: 2021-04-10 18:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9f27f7f4dd2f603e203090b48bc81152 SHA-1: 59cf30eb6fd867fad580ed27f681f2359f2512aa SHA-256: cc7a21eb00453c3cf8a40a43e7e68abb45bd321980e8b36175cff21115633b99
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://vilenefex.ru/strik?utm_term=plantronics+voyager+legend+5200+update PDF link annotation
    • https://xedukigujidazan.weebly.com/uploads/1/3/4/5/134512451/6f49b91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457838/normal_600a49f54ed0e.pdfIn PDF document text
    • https://gajamonorafu.weebly.com/uploads/1/3/5/3/135389334/telimolotir.pdfIn PDF document text
    • http://iuts.space/xipegadezegardn8z.pdfIn PDF document text
    • http://lenudes.com/bufosizomiberekaxtuka.pdfIn PDF document text
    • https://sudikefasegez.weebly.com/uploads/1/3/1/0/131070357/1864818.pdfIn PDF document text
    • http://rent-nout.site/ruretosotokabizitagapah4qbx.pdfIn PDF document text
    • https://wajiwojoduposop.weebly.com/uploads/1/3/1/3/131379590/17b25f.pdfIn PDF document text
    • http://magnetfix.store/988263932218tfpf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412575/normal_6006e90d99943.pdfIn PDF document text
    • http://laulu-go.ru/whirlpool_refrigerator_ice_maker_door_problems48ak5.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/jhg4hfC/ringtones_download_naa_ringtones.pdfIn PDF document text
    • https://cdn.sqhk.co/xanuramalu/chhaLij/mavagoduv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404969/normal_5fc6931a0653f.pdfIn PDF document text
    • http://everydayy.fun/dirorixibetifarekomomai9dee.pdfIn PDF document text
    • http://pipvip.ru/94210813949r9da7.pdfIn PDF document text
    • http://lovechat24.club/buddleia_pruning_guidev7ggq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/formato_para_crear_una_empresa_sas_en_colombia.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/vizio_d43-c1_remote_app.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_off0000f737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 5800 bytes
SHA-256: 3bf1613b171afeb11b2634a50167cf3be8533e0e77164154ea96ecb652770826
font_01_sfnt_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 11112 bytes
SHA-256: ac7173891696d22a68b1e5fb470fa0c3c9a6458a7abf755ec6ad16279846d25a

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