Malicious PDF — malware analysis report

Static analysis result for SHA-256 794ad485e9b34ad7…

MALICIOUS

PDF

75.7 KB Created: 2021-03-28 09:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 62e608ad9596bdd739386c2a581ed707 SHA-1: 956afd1131ce237bbd83b2bbb273ebff3970a9ed SHA-256: 794ad485e9b34ad77bb22ee2cc6f7971ad39099c835fa6cd37aa19ee250aa66e
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 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/award?keyword=bicornuate+uterus+treatment+pdf PDF link annotation
    • http://lilozekakotelup.sportsontheweb.net/ondas_tridimensionales.pdfIn PDF document text
    • http://fibisazorowax.mypressonline.com/kofazibunijuviv.pdfIn PDF document text
    • http://kutivefivugokev.mypressonline.com/20_types_of_amino_acids_and_their_structures.pdfIn PDF document text
    • https://movulejovem.weebly.com/uploads/1/3/4/4/134470355/babuxuzilevuduwesetu.pdfIn PDF document text
    • https://fililajivivumir.weebly.com/uploads/1/3/4/4/134456316/3534049.pdfIn PDF document text
    • http://galufixagomedo.getenjoyment.net/fepumapo.pdfIn PDF document text
    • http://nakotigolajeg.scienceontheweb.net/craftsman_tiller_carburetor_adjustment.pdfIn PDF document text
    • http://zokugorevat.mywebcommunity.org/91571280144.pdfIn PDF document text
    • http://demuxum.getenjoyment.net/82960374239.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sitafefisoju.atwebpages.com/goluvijumekunujul.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_fd2da13241ac41ae859a7b2e1117e6dd.pdf?index=trueIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_87ee06580da441ecadd726cd918540b0.pdf?index=trueIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_4c0a1fdcaa864d6fb35baa4f1a452b68.pdf?index=trueIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_57d7f0c192f64b33b5d28b13c5d1ee6f.pdf?index=trueIn PDF document text
    • http://tivakifuzir.atwebpages.com/vowurujofevizunodud.pdfIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_027b7e06f4ec4a6ea3411426779fe3e9.pdf?index=trueIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_27b94ceed1eb4a57bb0983717b7bbf25.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_697deeb2edcf4242b5810bead6b07612.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_off0000ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 5320 bytes
SHA-256: 76a625091f3544a04a9d50ba4cf4759ce976a5065c2389561e76adfd20e15eb1
font_01_sfnt_off0000fc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 10988 bytes
SHA-256: 5dbf76015281eb7fbe306652585bb1f6d1da0ecf9c1469391e3c8e5094cb74c2

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