Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c987c8b4f5f622…

MALICIOUS

PDF

105.9 KB Created: 2021-03-01 22:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d76fbab54895519afa48b503d579daa1 SHA-1: 8531db3186dbb4e70499d7be7fca29bbd1387636 SHA-256: 62c987c8b4f5f622e7b47ee4a40492916e36fc3360e3d1d74eff63f5b3c1380d
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a phishing lure, specifically a link farm designed to redirect users to malicious websites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the heuristics indicate a high volume of external links, many hosted on disposable domains. The presence of 'SE_PAYMENT_REDIRECT_LURE' and 'SE_CALLBACK_LURE' heuristics strongly suggests an attempt to trick users into believing there are payment issues or to contact fraudulent support, aligning with common phishing and business email compromise tactics. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://resalured.ru/award?keyword=what+are+the+problems+of+being+very+rich+and+wealthy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470828/normal_602ffa70f2e89.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/itghqAz/84618197386.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/MThjZ5x/93118662563.pdfIn PDF document text
    • https://cdn.sqhk.co/ragekasa/ykQggtS/52560341726.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/jigeIhf/mobekese.pdfIn PDF document text
    • https://cdn.sqhk.co/tesigasefaxe/fXjjggs/29544640544.pdfIn PDF document text
    • https://cdn.sqhk.co/dojidavos/ggzjdNp/67751138066.pdfIn PDF document text
    • https://viwosexoteb.weebly.com/uploads/1/3/4/6/134631328/5a1960.pdfIn PDF document text
    • https://luwagibefex.weebly.com/uploads/1/3/5/9/135966535/naduxaredisin-duseduravig-kulatunaf-relugek.pdfIn PDF document text
    • https://lexeparuma.weebly.com/uploads/1/3/1/3/131380616/suxorevi.pdfIn PDF document text
    • http://nefritthebestthing.site/49015886586nmurp.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/bafokirega.pdfIn PDF document text
    • https://fuxiwuzepideka.weebly.com/uploads/1/3/1/3/131381491/kusidebabot-zupejo-nofogoxitogev-nenifotiper.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/83174027097.pdfIn PDF document text
    • http://robolab.one/58446784743eb52k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482853/normal_5fddb1ee0e6cd.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/are_chromebooks_any_good_for_schools.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/burelebabak.pdfIn PDF document text
    • http://7lessons.site/what_is_word_families_in_kindergartenj7hxk.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
    • 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_off00014c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C91 5764 bytes
SHA-256: cd4273115da2e56113741a8cbbee2fac28ca1cccd3150962bd9707958b537d54
font_01_sfnt_off00016024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16024 13276 bytes
SHA-256: f9a605ee7e48bd0e59d5df897b44fcc5835e6066af7ef7a913aa751a80ff4bb9
font_02_sfnt_off00018b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B4E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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