Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69f9efb96e02573…

MALICIOUS

PDF

67.3 KB Created: 2020-11-13 08:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84b56846062866df06deba52b1853e05 SHA-1: 6e83226848e99d624e2218c41e76e8da782f2cce SHA-256: a69f9efb96e0257347a4f9b7fdb29ce5df4af7f3953e1cfe1b9ae238548d1679
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to other PDF files, suggesting a link farm or spam distribution tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=free+printable+bingo+templates+blank
    • https://boseveju.weebly.com/uploads/1/3/4/5/134595203/4687962.pdf
    • https://xepebujusu.weebly.com/uploads/1/3/4/3/134319702/rikopol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e21df87b-d10c-48eb-96f3-ab609d04d957/benenazopowikeseparafare.pdf
    • https://uploads.strikinglycdn.com/files/b8fb8d74-533e-4d98-9175-0afb6fe66875/8153874920.pdf
    • https://s3.amazonaws.com/wilugugo/zuzazelajoraveweko.pdf
    • https://s3.amazonaws.com/gorajikunobixi/cadaver_exquisito_agustina_bazterrica.pdf
    • https://uploads.strikinglycdn.com/files/e1f99ef5-8a57-4c59-9b8d-af2e41df1dd5/85350653529.pdf
    • https://s3.amazonaws.com/jepavilutabilel/dumumirugubufexizuw.pdf
    • https://uploads.strikinglycdn.com/files/3bcb2474-458c-4a83-a63a-5323568ecc13/mejor_torrent_series.pdf
    • https://uploads.strikinglycdn.com/files/c27a1cc6-d8a3-4230-9e27-fc8e5e3c06c7/8531245891.pdf
    • https://s3.amazonaws.com/luresimosip/97010762620.pdf
    • https://s3.amazonaws.com/bupijila/cours_amplificateur_diffrentiel.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_off0000c7f6.bin
f410e90b507ff894eca89f9a330b0b9b274a3eb1c8b689c858321fb341cbb092
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F6 5296 bytes
font_01_sfnt_off0000d9e5.bin
b8c52fa2aae1bad0b9ab425cf9e2f835efd4f9cd1afd53f158013f6662405674
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 11120 bytes