Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a69ff78108ffd78…

MALICIOUS

PDF

136.9 KB Created: 2021-02-14 06:16:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 31dbabe53afe7304ae4476d0f24b3aed SHA-1: c72c399a78066efe1c2ce43aedab0b4cd1aa0338 SHA-256: 3a69ff78108ffd7836ca7afb704a918f42d10b9249dc324b8961641febd60968
134 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to be a lure, possibly related to a 'guide', to entice users to click on these malicious links.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wix?keyword=crusader+quest+sigil+guide PDF link annotation
    • http://appletopshop.ru/bhai_bolte_dj_remix_songhf8bm.pdfIn PDF document text
    • https://pogudemuzam.weebly.com/uploads/1/3/4/0/134018755/1063ff87.pdfIn PDF document text
    • https://wumaluruporemad.weebly.com/uploads/1/3/0/9/130969386/2576993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_5fd64c515659d.pdfIn PDF document text
    • https://cdn.sqhk.co/wixakulu/gdwL2wf/7826685952.pdfIn PDF document text
    • https://jitebemaduk.weebly.com/uploads/1/3/4/6/134692965/nubejo.pdfIn PDF document text
    • http://mysteps.online/39082747376vgr0l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424330/normal_5fe41737416ef.pdfIn PDF document text
    • http://introdom.ru/apa_format_book_citation_two_authorsqcopd.pdfIn PDF document text
    • https://moxalabukeziro.weebly.com/uploads/1/3/4/7/134772199/kuzok_begonumuniw_pipawininupisez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387241/normal_6010c10fdcc4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380883/normal_5ffeff910f822.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530868/normal_5fff0e6b3c44d.pdfIn PDF document text
    • http://dressnbuy.com/cyclobutane_reacts_with_hbr_to_formt2x6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuvipapijulabu.epizy.com/sirejovupujulutuwetolido.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/wrong_turn_6_movie_trailer.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_off0001e126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E126 5024 bytes
SHA-256: 1264c8a9e70b5ace1beddd16cf622e07bc36168b89e253607a4495da3b5d285b
font_01_sfnt_off0001f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F237 10592 bytes
SHA-256: cf0352e7cb7b6dd9e6c7b907ad610881f20e6389fa9b314ce4d178963671d3c0

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