Malicious PDF — malware analysis report

Static analysis result for SHA-256 a634e5b0d4937d3a…

MALICIOUS

PDF

68.6 KB Created: 2021-03-14 21:58:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 45f6ee544328383dfdb6c7793ef375f7 SHA-1: 16813e6967d0dde7df341d9b0484e8ead33f44bc SHA-256: a634e5b0d4937d3a1fbbf60456ae880b6a307ba509201ec75f682fad59f8b74c
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 0.9997

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://jacksth.ru/wix?keyword=software+systems+architecture+pdf+download PDF link annotation
    • https://cdn.sqhk.co/vagekasip/gPagdjh/36110749125.pdfIn PDF document text
    • https://linazigamatamab.weebly.com/uploads/1/3/1/8/131856602/winadiwekoguresuki.pdfIn PDF document text
    • https://cdn.sqhk.co/dizukenepu/Jtgfhcb/purosuwixob.pdfIn PDF document text
    • https://cdn.sqhk.co/rowofabuf/gigd0GX/2992234019.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/aygcCje/farm_heroes_super_saga_on_facebook.pdfIn PDF document text
    • https://dexuwoborusise.weebly.com/uploads/1/3/4/3/134375282/1670768.pdfIn PDF document text
    • http://nelodagavezes.mygamesonline.org/72264408898.pdfIn PDF document text
    • https://jamiwimavebu.weebly.com/uploads/1/3/1/4/131453695/fizuvatoxowaruj.pdfIn PDF document text
    • https://senekuzoje.weebly.com/uploads/1/3/5/9/135978249/diviwotedin-vugedidaru.pdfIn PDF document text
    • https://kuwumezebuxe.weebly.com/uploads/1/3/4/1/134131528/29bed4.pdfIn PDF document text
    • https://gojijaxokan.weebly.com/uploads/1/3/0/7/130739343/bixurupizijabuze.pdfIn PDF document text
    • https://kaxamutibe.weebly.com/uploads/1/3/5/3/135348628/zujemivala.pdfIn PDF document text
    • http://goligofalu.medianewsonline.com/laboratory_safety_rules.pdfIn PDF document text
    • https://gukegibulu.weebly.com/uploads/1/3/4/6/134668459/7250923.pdfIn PDF document text
    • https://cdn.sqhk.co/livisade/Uiagfy1/33812178974.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kotopofixivu.rf.gd/definicion_de_auditoria_gubernamental.pdfIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_9208d04163c84730aabf81a8725b5cf3.pdf?index=trueIn PDF document text
    • http://sosozodazu.epizy.com/utm_thesis_writing_guide.pdfIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_ec8a8a70f4914ed89967dab1ed26e077.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_5aead5c21fd945c086ffffcb18725b57.pdf?index=trueIn PDF document text
    • http://gabukinof.epizy.com/28615917138.pdfIn PDF document text
    • https://www.cancer.gov/coronavirusIn 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_off0000cd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7D 5692 bytes
SHA-256: 04650b4e1943681e81529744cb3c34852c553d5ccff888c64b5a961947180ee9
font_01_sfnt_off0000e0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 10624 bytes
SHA-256: b0db9404b49015b85188865061d79cd4f47783fabfd88e99d459ac8d9cae75ca

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