Malicious PDF — malware analysis report

Static analysis result for SHA-256 643dbdfa1f829c12…

MALICIOUS

PDF

61.5 KB Created: 2020-11-17 04:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 56e36d8a221ef1cb7079e26f1f260c01 SHA-1: 197a1b9941732925a89f965da99c2efa40cb23ed SHA-256: 643dbdfa1f829c12437d7fd685446390469bc4d912ac9166c1cef705c28c795e
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 0.9995

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://traffset.ru/123?utm_term=seventh+greek+letter+crossword PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411500/normal_5fa263a045381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f8d10fd4d3e7.pdfIn PDF document text
    • https://gejovekozeja.weebly.com/uploads/1/3/4/4/134401956/fezagenanotemi-kasubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f8747d44ecbf.pdfIn PDF document text
    • https://kozezivu.weebly.com/uploads/1/3/4/4/134444222/39fc92fdbc08ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417648/normal_5f995e3e7af1d.pdfIn PDF document text
    • https://lubuminovek.weebly.com/uploads/1/3/4/5/134590555/dekemabewixirawez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_5f9b8b350a2fc.pdfIn PDF document text
    • https://pibefabetanob.weebly.com/uploads/1/3/4/3/134376782/welurufebarusob.pdfIn PDF document text
    • https://tijisevivojo.weebly.com/uploads/1/3/4/5/134502531/fuvekofawajad-juvekanilula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455876/normal_5fa5d59a4da30.pdfIn PDF document text
    • https://lepuzabokagat.weebly.com/uploads/1/3/4/3/134333079/morov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/baffa941-c1b2-4bee-b84c-543e10647b96/pifeb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA84D 5048 bytes
SHA-256: d8db63297e2aca4eb9bce033b147029d54e1b696e49eb34f8335df25154935e4
font_01_sfnt_off0000b980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB980 9840 bytes
SHA-256: 78ec24246cbcc863137d4b8e539b5cb16dae21499a34abe5750a8c89c805d7b1
font_02_sfnt_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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