Malicious PDF — malware analysis report

Static analysis result for SHA-256 62545733006750e8…

MALICIOUS

PDF

70.6 KB Created: 2021-05-18 11:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d8b3b7791e2e22becb0c93e18f4b620c SHA-1: b45c3e46969b8564a3e7b7d2827a1789a25721fa SHA-256: 62545733006750e82d51c31dc755ca522764cca9c90f2dab256029c9aff44f95
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery via these external links.

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://pelibifir.ru/strik?utm_term=international+financial+management+13th+edition+jeff+madura PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443619/normal_60082bb5ace30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475016/normal_6038bd5392b79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371786/normal_5ff65826bbf02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480582/normal_5fd8d303002f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_604891744137a.pdfIn PDF document text
    • http://zuvinesewuwiz.iblogger.org/javikaren.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_604b1c6740256.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403259/normal_5fcbb2bf4fd25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418362/normal_60261fbce9113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467573/normal_601f16661e3a2.pdfIn PDF document text
    • http://ferobuxanax.iblogger.org/battleon_estate_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://punozow.epizy.com/prepositions_of_time_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/que_significado_tienen_los_tatuajes_de_serpientes.pdfIn PDF document text
    • http://rusireges.epizy.com/sojelosuwedova.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/luduxufadujakamenapepuzel.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/77747380387.pdfIn PDF document text
    • http://xijopugoluf.rf.gd/88861690131.pdfIn PDF document text
    • http://lapakak.rf.gd/answer_how_are_you_doing_today.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/manaxamepuvewokumikuwumot.pdfIn PDF document text
    • http://jigosip.epizy.com/55208415188.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_off0000d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 5488 bytes
SHA-256: 7e6ba21e37c1c346b2cdbb50bbbfbd82761fc1dddaa57975bb9a9e275b66679d
font_01_sfnt_off0000e737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 10580 bytes
SHA-256: bcf68d8cd0e4441dfc337d2be6c96eb8e037d4235fc36832a57a7c5a02df7f40

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