Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49815b6b5173ae2…

MALICIOUS

PDF

83.6 KB Created: 2021-03-18 06:56:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 50ffa44846e44faac81efedb4fcd3c6d SHA-1: b4e5c198219fd493ebaa5cec0c278c735be327f1 SHA-256: c49815b6b5173ae2aa1c8e8c189c3428ea0c3481846eba2ef088e1d29ef18788
186 Risk Score

Malware Insights

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

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 0.9994

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/award?keyword=bteup+syllabus+2020+pdf+download PDF link annotation
    • http://fonareru.22web.org/xevemagasigibagazopuko.pdfIn PDF document text
    • http://wurenuzuludesu.22web.org/muzejobobaxofifaxigeg.pdfIn PDF document text
    • https://garegijewavib.weebly.com/uploads/1/3/4/3/134389285/a14a77fa4a7.pdfIn PDF document text
    • http://tajeromodovo.66ghz.com/liwupo.pdfIn PDF document text
    • http://denizan.com/19885347485jxt14.pdfIn PDF document text
    • http://iciapp.xyz/rixijuzosaxatibamk1yv.pdfIn PDF document text
    • http://roburupagosode.iblogger.org/widobejadajij.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/1f6e7b026c8612.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_7114ed656f014052b2a623b5fa4e1987.pdf?index=trueIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_1d3fbc999f4f4c44a98b171b6d90a26e.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_0b4c3280f2c94f3a9cec242cc6ccba1a.pdf?index=trueIn PDF document text
    • http://vituzitozitu.epizy.com/37648323502.pdfIn PDF document text
    • http://manepiri.epizy.com/meloti.pdfIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_7fc09cebb48a4cad9b98d83909ebdcc8.pdf?index=trueIn PDF document text
    • http://vudexejuvejutek.rf.gd/what_are_the_elements_of_interactive_public_relations.pdfIn PDF document text
    • http://gametusepezuka.rf.gd/putowitimivusegomufud.pdfIn PDF document text
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_5beee445c9ab40aeb2a1766d3d614879.pdf?index=trueIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_3b12f8cd970b42f88d59eed7ba852cd0.pdf?index=trueIn PDF document text
    • http://kepinud.rf.gd/sipubinizalufepoki.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_ae99b581af58471abcbb8a522d0bbae1.pdf?index=trueIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_b372021a76d44f368ffc6399b2f7860e.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_a823478f55fb430cacb2014e43c1d9c3.pdf?index=trueIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_471261848f694881bcb6b20c3145b3ea.pdf?index=trueIn 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_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 5596 bytes
SHA-256: 5b876662c789b09100036285d4587431c98debd42565e616c499456a9331afb7
font_01_sfnt_off00011b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B64 10956 bytes
SHA-256: 85ee3573590a8f17a7bafb9e9e3f4d6154d18b571b5729595fdb05a1001e45a6

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