Malicious PDF — malware analysis report

Static analysis result for SHA-256 701cc72dc886f334…

MALICIOUS

PDF

76.1 KB Created: 2021-05-01 23:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 01e33e4375d7a7c7237a921e16949615 SHA-1: 0f4e46dfbdae812a4fbb74d46a7a307dc53c5534 SHA-256: 701cc72dc886f33423356b336994c596e9185df35d7fc0b929fd377268cf81c2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable domains, consistent with a link farm designed to lure users to malicious content. The document body, though partially corrupted, contains references to 'interview questions and answers', a common lure for phishing documents.

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://resalured.ru/strik?utm_term=angularjs+interview+questions+and+answers PDF link annotation
    • http://zabafijazone.iblogger.org/97633434822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_60301fd9d0f50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455669/normal_606d487d35829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_5fe794d15447d.pdfIn PDF document text
    • http://akmurzina.com/konegijop0q9td.pdfIn PDF document text
    • http://fastnoutservice.ru/vista-21ip_quick_user_guide9c6xv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378846/normal_5ff9421a3e9ab.pdfIn PDF document text
    • http://kuxixel.iblogger.org/market_research_analyst_job_description.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427313/normal_6015adcce52ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_60143fea4b6c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485572/normal_601a5722e051e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_60458e95de7ca.pdfIn PDF document text
    • http://damita.fun/steven_slate_drums_4_torrent2ry8n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488329/normal_603df5cf28a14.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwibinewife/geLiahc/sharon_ifedi_movies.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/ieGiiNT/my_lottery_dream_home_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vobujubiga.epizy.com/angular_8_tutorial_franais.pdfIn PDF document text
    • http://gupunekatomez.rf.gd/mabuzodogugiwedizevewapux.pdfIn PDF document text
    • http://lugubukegi.epizy.com/54618951482.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_off0000edd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 5336 bytes
SHA-256: a179623ab27e126698d2118a0bf5f934dfbb9d73d15a561efb21de0f04084941
font_01_sfnt_off00010020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10020 10768 bytes
SHA-256: c37b426d927f6a4a217d9d2906ffc24cfc625a016584175216a34e8e48d841ae

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