Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58a40cc04ce2bf2…

MALICIOUS

PDF

75.9 KB Created: 2021-06-05 08:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7a894ceb3c7526d48cefefadb3e8d6be SHA-1: c3463a48fad0b306bbeb5de4f7dc9b402b915d29 SHA-256: b58a40cc04ce2bf2365e440812e6a6f1d9f2e90510a8f8777ea2c60e8f7d0996
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://nomylo.ru/pbw?utm_term=how+to+become+a+vet+tech+texas PDF link annotation
    • https://sejoxamopizava.weebly.com/uploads/1/3/1/8/131858661/66595511.pdfIn PDF document text
    • https://zedawaven.weebly.com/uploads/1/3/4/6/134634651/begovo-wejus-wuvikegalevez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383794/normal_5ff67a94bfa71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417418/normal_602bf58d742d9.pdfIn PDF document text
    • https://wadozivapo.weebly.com/uploads/1/3/4/5/134512268/3062209.pdfIn PDF document text
    • https://vonebofakakare.weebly.com/uploads/1/3/1/8/131856314/ludekezaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468267/normal_600c1a5f38ae8.pdfIn PDF document text
    • https://woliremokeg.weebly.com/uploads/1/3/4/3/134340334/fagetejazigijed-vukapodo-xujulixosifap-xafunag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478408/normal_606d5b674bfa2.pdfIn PDF document text
    • https://besuxape.weebly.com/uploads/1/3/4/3/134374749/pabizisejene_liwigidukis_vulogajav_porixozi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451374/normal_60006de610a0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473049/normal_5fd67ac7829a7.pdfIn PDF document text
    • https://bakemelufipunuj.weebly.com/uploads/1/3/4/8/134888112/da733b300a.pdfIn PDF document text
    • https://gebuzikiko.weebly.com/uploads/1/3/5/4/135400935/00c0b3adf890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476767/normal_60125dbb1b6a9.pdfIn PDF document text
    • https://jesodiretax.weebly.com/uploads/1/3/4/6/134659119/2bf03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470209/normal_5fd05dd079b9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sirazumebow.pbworks.com/f/74337237397.pdfIn PDF document text
    • http://zafasuvolo.pbworks.com/w/file/fetch/144623748/fudozuzatuzevinepesoto.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/how_to_resolve_conflict_in_the_workplace_essay.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/w/file/fetch/144412254/40764052749.pdfIn PDF document text
    • http://gozuwef.pbworks.com/w/file/fetch/144503427/abc_chart_free.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_off0000e824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 5232 bytes
SHA-256: 7e1f03da6083fe844898c182a40492235058ed138c7a83823fc75564cf836206
font_01_sfnt_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 11844 bytes
SHA-256: b144cf501eded9edd82ac65584ad9909d622df556967533827654ccd06e6aee4

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