Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f99945537c338b…

MALICIOUS

PDF

73.7 KB Created: 2020-12-31 09:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b08e194c1525bdde4f2459566380fb6c SHA-1: 6aa75c89ff31f3758bd60a99785b21366b07df04 SHA-256: 73f99945537c338bd58f88cb8e558f7d850d1826d9ba1933d97d9d57eebe4afa
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt, likely to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://traffmen.ru/strik?utm_term=no+jumper+hard+music+video
    • https://sikisesuleze.weebly.com/uploads/1/3/4/4/134445421/midazoxan-jatokumujoz-nubodovutuguxu-potamavavox.pdf
    • https://cdn.sqhk.co/vibifexode/icibtU0/mutilela.pdf
    • https://cdn-cms.f-static.net/uploads/4459780/normal_5fa65084081c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kekunawi/shriners_gun_show_wilmington_ma.pdf
    • https://s3.amazonaws.com/vifusupegiza/vizofunibafenexe.pdf
    • https://s3.amazonaws.com/loranoduzuja/42875623898.pdf
    • https://s3.amazonaws.com/rodiligarexo/37520790029.pdf
    • https://s3.amazonaws.com/suxiweke/big_george_rotisserie_parts.pdf
    • https://s3.amazonaws.com/kufazete/capital_one_venture_benefits.pdf
    • https://s3.amazonaws.com/sasufufa/criminal_law_amendment_act_2013_in_hindi.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_off0000d60b.bin
4dc4280d853a594ae286d8b1a8eb018c9a9cd1b73cec53758e1a6836abcb0bef
pdf-font-stream PDF embedded font (sfnt) at offset 0xD60B 5080 bytes
font_01_sfnt_off0000e75a.bin
528b675c2f6bdc8c4a1e8ed5827ed3104a291706097041b5229f3447c7f59192
pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 11084 bytes
font_02_sfnt_off00010be2.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 4324 bytes