Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f5ea4b449b8532…

MALICIOUS

PDF

60.8 KB Created: 2020-11-13 11:08:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7875a1963259a744ef6d4312a4573271 SHA-1: 1dc4872215df52445125fc44efc4e36a240539d6 SHA-256: a4f5ea4b449b8532894b15fa7202b616dcceb8479959e59348705a54d1a07ced
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. The document contains a mass of external links, likely for SEO manipulation or to host malicious content, with one prominent URL being traffset.ru. The presence of embedded links and the overall structure suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://traffset.ru/strik?utm_term=vampir+akademisi+izle+t%25C3%25BCrk%25C3%25A7e+dublaj PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419623/normal_5f9b62c9438ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446029/normal_5f9d1f5094471.pdfIn PDF document text
    • https://ludasajuwo.weebly.com/uploads/1/3/4/0/134096591/2316384.pdfIn PDF document text
    • https://pozopili.weebly.com/uploads/1/3/4/3/134310053/b9cbb2cc06d89a6.pdfIn PDF document text
    • https://bobepeduzogir.weebly.com/uploads/1/3/4/6/134673546/sulotilojarefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_5f91845135542.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/zetubakuz/50321810447.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/temejupikiponazin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c953bb24-fe24-44a1-8397-924297617717/jezojifuwuvusival.pdfIn PDF document text
    • https://s3.amazonaws.com/xatojem/80959120692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7639f63-a479-4815-8533-f2d88e17de3e/bowoluvumuwogapakasefi.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/kennedy_accounts_investing_scam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d499bd1b-fcb6-4a29-b9bd-99d0b9db8eb5/55762619596.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_off0000aef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF9 5700 bytes
SHA-256: 6d76f80d68e789c750e318cc3e7475531a50ba9ca527055de9e1d3c701f7993f
font_01_sfnt_off0000c21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21C 10796 bytes
SHA-256: 5b8947b117322dc15d56764cdfa4599cdb4146a6c251453aa78960041765ef52

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