Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37d9bb4454db283…

MALICIOUS

PDF

81.1 KB Created: 2021-02-28 00:20:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6ef0ace9764ec2fbc7a8c679bc13abcc SHA-1: 29fdb0bd333123544c0a26c612433fd718481ff1 SHA-256: a37d9bb4454db283a73873afc30cfb7934de31f60ddcb06855e03c181d700803
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for repeated payload link lures pointing to 'https://golowaki.ru/strik'. Another heuristic indicates the PDF acts as a link farm, with a sample URL 'http://aazzzry.space/zutigucrhmo.pdf'. The presence of these links and the ML classifier's high confidence score suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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.
  • 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://golowaki.ru/strik?utm_term=dirt+devil+power+max+pet+bagless+upright+vacuum+cleaner+ud70167p+-+walmart.com In PDF document text
    • http://aazzzry.space/zutigucrhmo.pdfIn PDF document text
    • http://zizopeja.22web.org/52361619797.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476564/normal_600418abb1afc.pdfIn PDF document text
    • http://katorewudejizut.22web.org/customer_service_week_lost_package_answer.pdfIn PDF document text
    • http://jafalule.22web.org/kutiz.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/dajewodizezedove.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368496/normal_5ff9a4e363080.pdfIn PDF document text
    • http://re-capital.ru/film_frozen_flower_korea2s6vj.pdfIn PDF document text
    • http://businessmentality.com/90275327988no92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lelupiborojez.epizy.com/artistic_fonts_for_logo_free.pdfIn PDF document text
    • http://timikawimi.rf.gd/azar_grammar_workbook.pdfIn PDF document text
    • http://vujaxafib.epizy.com/callan_method_teachers_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/accu-chek_fastclix_lancets_102_each.pdfIn PDF document text
    • http://tovujopojat.epizy.com/favuvekotevosesofululepi.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/184276211.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/les_miserables_25th_anniversary_soundtrack_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/tidelofim.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_off0000f925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF925 6340 bytes
SHA-256: e252e83746b6f86fb6be71ae6bf62761eefce69983e2cc1dfa273b212192d5cd
font_01_sfnt_off00010ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBB 11720 bytes
SHA-256: eca4ef73aa79e1e443d5778f352795ad9440907389e4b2ced2f02785c11cbc71

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