Malicious PDF — malware analysis report

Static analysis result for SHA-256 7facb6d65665be85…

MALICIOUS

PDF

76.1 KB Created: 2021-01-11 11:39:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd9ea9ab2b53e996eeffc5a64b420809 SHA-1: 5db23468d1cb5a579f0143c958fe64fe6ff1e62f SHA-256: 7facb6d65665be857a2009d678588b267f40b0e261a35847d9a7b9066003e217
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, identified as a link farm, with one prominent URL pointing to a carburetor manual. This suggests a phishing or malware distribution attempt, leveraging a seemingly innocuous document to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent.

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-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://trafftec.ru/123?utm_term=edelbrock+carburetor+manual+choke+kit
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/9676616.pdf
    • https://cdn-cms.f-static.net/uploads/4374177/normal_5faa49514ad53.pdf
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5f8ee41eb9e57.pdf
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/rokatugumaveruja.pdf
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/9739696.pdf
    • https://site-1201991.mozfiles.com/files/1201991/64507026032.pdf
    • https://cdn-cms.f-static.net/uploads/4476123/normal_5fb33f297e29b.pdf
    • https://static.s123-cdn-static.com/uploads/4420037/normal_5ff22d31ad32f.pdf
    • https://static.s123-cdn-static.com/uploads/4416143/normal_5fc4a201d471d.pdf
    • https://site-1194434.mozfiles.com/files/1194434/bbq_wings_near_me_delivery.pdf
    • https://cdn-cms.f-static.net/uploads/4456114/normal_5fb2e675a39ec.pdf
    • https://wefigofotagovir.weebly.com/uploads/1/3/4/8/134864379/6611821.pdf
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/rofoweje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xebuvuwov/nopebisib.pdf
    • https://s3.amazonaws.com/sisaxu/sageniluroninoxutevupifi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df7f.bin
cf4421082ab5933ac6b104b8d7c5ef2b313895cd51a85eb16501cf3e05bd0369
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 5044 bytes
font_01_sfnt_off0000f06e.bin
504a053809ce19c3480aafb58ad5a73dd4a6cb7680e2ffcf29e844b51884cf5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 10904 bytes
font_02_sfnt_off0001157f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1157F 4324 bytes