Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cc8b686c091a93…

MALICIOUS

PDF

82.9 KB Created: 2021-03-18 08:42:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8f65ac3685c5bc7d0abb6a49823ed645 SHA-1: 84afbaf0ce9bf231173ca587c7510f8a23946e3d SHA-256: 37cc8b686c091a93ac068bb49681d5ff7ebbd58fa44e2a0460babfd12537e6f1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 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 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.
  • 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://nipisod.ru/wix?keyword=macbeth+act+2+scene+1+study+guide+answers PDF link annotation
    • https://botamelojobowi.weebly.com/uploads/1/3/5/3/135344227/6f5ce98.pdfIn PDF document text
    • https://sikupawabur.weebly.com/uploads/1/3/4/6/134624396/wifuzibotozelex-pomoxesetov-patiz.pdfIn PDF document text
    • http://autocredit.moscow/267878594871cf6.pdfIn PDF document text
    • https://fezuxikazosulav.weebly.com/uploads/1/3/1/3/131398093/gapikesupimosasidud.pdfIn PDF document text
    • http://frukt.space/selolebubilurowowogov3uz8e.pdfIn PDF document text
    • http://matteset-spon.space/padadevadesifavapinor4vh07.pdfIn PDF document text
    • http://goregujage.iblogger.org/interview_questions_on_java_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404725/normal_5fd945bf60125.pdfIn PDF document text
    • http://nesobaka9.xyz/ferideripawofixvsrwr.pdfIn PDF document text
    • http://milawigigobo.iblogger.org/67200190164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403407/normal_5fdc7ddc7afc7.pdfIn PDF document text
    • http://gogejevi.iblogger.org/vimorexitik.pdfIn PDF document text
    • https://menanolunum.weebly.com/uploads/1/3/4/7/134754058/bd19d4.pdfIn PDF document text
    • http://katalog-siberian-force.online/why_will_my_gear_shift_not_movetlv7x.pdfIn PDF document text
    • https://vubutebifakalax.weebly.com/uploads/1/3/0/7/130775259/87f109bba.pdfIn PDF document text
    • http://insurancecarusa.com/neet_2019_answer_key_aakash_code_p3oqdw9.pdfIn PDF document text
    • https://turexebino.weebly.com/uploads/1/3/4/2/134265835/satukovute.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zabuzuko.epizy.com/86623347857.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_off00010306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 5692 bytes
SHA-256: f63002c14876084375c6f17c0ce691679d77cab9be1bab0f64f2e9051fc1b9ee
font_01_sfnt_off0001168b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168B 10944 bytes
SHA-256: aa61a0c7ccb2bc4a12068361c64f979cb940b499577e76aa2316e338066b15b6

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