Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a0a913ab5a26fe…

MALICIOUS

PDF

72.0 KB Created: 2020-12-21 13:29:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee7dbb66f5a254740dd3bbd6531fd5b4 SHA-1: 28548e6fe28a48076dc405036443cf9cc74d37b7 SHA-256: b7a0a913ab5a26fe7e2be3a7fe0f13ebee365860970cf854e8a231137f6a96a4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/123?utm_term=stronghold+builder%2527s+guide+pdf
    • https://cdn-cms.f-static.net/uploads/4460694/normal_5fc37f3e3058a.pdf
    • https://cdn-cms.f-static.net/uploads/4457330/normal_5faed9b6d52ad.pdf
    • https://bimenejujuw.weebly.com/uploads/1/3/4/5/134592033/a0fb1a74d8a.pdf
    • https://cdn-cms.f-static.net/uploads/4414678/normal_5f99dbfd0e4ce.pdf
    • https://vuteduwezo.weebly.com/uploads/1/3/4/3/134336695/8dcd7d32e43.pdf
    • https://static.s123-cdn-static.com/uploads/4450723/normal_5fcb3d9b3f927.pdf
    • https://cdn-cms.f-static.net/uploads/4412599/normal_5fb75cd0902c4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fde97c9d0ff57695e6cefc3/t/5fdf1008f5f642265655b6e0/1608454152508/62688192907.pdf
    • https://uploads.strikinglycdn.com/files/a8dea4ec-8d19-443b-ae7c-5d6a8ef7e904/92505804580.pdf
    • https://s3.amazonaws.com/gorajikunobixi/tedowopokefajasakekeput.pdf
    • https://uploads.strikinglycdn.com/files/3e44276d-e5ae-483b-95e3-727d1ca94af9/wyvern_saddle_ark.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf9b618e72e5fdb9caef7/1606285752043/rizulufoxitagafutopugoxi.pdf
    • https://s3.amazonaws.com/tenunud/chemistry_book_11th.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da9f.bin
b4fbbf2ce1fcdf210c0b1b87ba4a0e58015801bdacee97c20d0585cc8f74f9b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9F 5372 bytes
font_01_sfnt_off0000ecdb.bin
9a3bca1e9f08c8357ecb82b3ec5e09c8da2b0856e04a86d77706ba84ea2b7e71
pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 10728 bytes