Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd407d77829b568…

MALICIOUS

PDF

69.6 KB Created: 2021-05-20 02:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cc80e75db795f960e64e1b26b7263879 SHA-1: a9ce1f8db2ef43993df71e066f7e5aa80369a4e2 SHA-256: 0cd407d77829b5685fcd68cea68086997eb7d98c2d581e1ccaf3e5f5325b3f41
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 0.9998

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://xezojetit.ru/strik?utm_term=r%25C3%25A9ussir+le+delf+scolaire+et+junior+a2+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451021/normal_6021534f4fcb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455370/normal_5fdd2ec84584a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390381/normal_6027c5d333783.pdfIn PDF document text
    • https://kaziwudajolegol.weebly.com/uploads/1/3/0/7/130738741/lufanarelegi.pdfIn PDF document text
    • https://towavakivuno.weebly.com/uploads/1/3/5/3/135318123/pejewog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479688/normal_6009b4f04b1e8.pdfIn PDF document text
    • https://nenatuver.weebly.com/uploads/1/3/4/0/134017756/247169.pdfIn PDF document text
    • https://jepexilopenokaf.weebly.com/uploads/1/3/2/6/132680937/pojuxatitunupegimab.pdfIn PDF document text
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/kemovatax_fopajevito_lejit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379726/normal_5feb89586d378.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491451/normal_5fca58ce43cf9.pdfIn PDF document text
    • https://xajevopo.weebly.com/uploads/1/3/2/6/132682124/8229535.pdfIn PDF document text
    • https://gatevipamor.weebly.com/uploads/1/3/4/8/134878843/739219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_606479f2bb81e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_604036c016c8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_6052fda766112.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tevigotu/32938483713.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/vagaxuwujozifozat.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/greek_mythology_names_meaning_beautiful.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_off0000cd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD99 5504 bytes
SHA-256: a6ab325b5a8051cd4a4fa233c148533ed7555f1ace640537cff189930ab7d2c6
font_01_sfnt_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 12788 bytes
SHA-256: 5a57d3b0827eb45c798622a559b2715d64e9fb8b2550f0d4582e571064cf6451

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