Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0cd51e88df6e055…

MALICIOUS

PDF

68.7 KB Created: 2021-03-24 06:34:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b78ec188d0a77f4fa087d4610a8897f3 SHA-1: c1b4a583510ebf4f7f12f7a94e469efd25585f03 SHA-256: b0cd51e88df6e055176e6533c83987e3aee3b0faafabdd778564550013803301
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://golowaki.ru/strik?utm_term=rii+mini+x1+not+working PDF link annotation
    • http://lawexape.mygamesonline.org/tugigebaripodefamubuder.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484169/normal_6008d14fb0161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_603be0ecbb409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_605a79536a6c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476930/normal_5ff19ab0aa237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378856/normal_602c65cce0272.pdfIn PDF document text
    • http://gifagudilul.mypressonline.com/94398899942.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448719/normal_5ff4c82fb507d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_6044420815323.pdfIn PDF document text
    • http://efarbok.xyz/what_weight_is_bernat_roving_yarnowull.pdfIn PDF document text
    • http://remontlegko.info/kotowepawoxircqba.pdfIn PDF document text
    • http://mozaduz.mygamesonline.org/lewefitetapupizupejux.pdfIn PDF document text
    • http://wizapivizesib.mygamesonline.org/96536810743.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e9ba1c-1732-4d9a-b41d-88ae78f7a45d/14083056915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c1bb02-d1f1-4db3-bc43-20e58415d299/what_is_the_poem_the_dream_of_the_rood_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00804bf-8fec-4589-9320-a62c74820507/22458658524.pdfIn PDF document text
    • http://neveraworas.rf.gd/lowid.pdfIn PDF document text
    • http://lukobefazerare.rf.gd/pijoregajedit.pdfIn PDF document text
    • http://roxoretubobo.rf.gd/flash_pasteurization.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7a3a1a7-ea16-41aa-841e-ef4e90c20ce2/tipos_de_grupos_psicologia_social.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD087 4868 bytes
SHA-256: ca8ac51b0622c4e1aa597b530c463933cc142438ab727db8037593eedd7fea28
font_01_sfnt_off0000e124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 10772 bytes
SHA-256: e6ae0eb3e36623b364e6858fa0aa0f5e2418651afba188daa21c02d03e65977b

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