Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2f395ab0997260…

MALICIOUS

PDF

74.7 KB Created: 2021-02-22 18:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3253783e3f16d54bf52f0eefbb2eb3c7 SHA-1: 33c763f07b9225be5cf074c11a4540ae89d3187f SHA-256: 2a2f395ab0997260b46e9e5880f0e09258492685831f9040b6641be1a95bbea4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

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://leonvi.ru/wix?keyword=contract+bridge+point+count+bidding+guide
    • http://dilurijarejo.22web.org/darude_sandstorm_trumpet_sheet_music.pdf
    • https://vozokeku.weebly.com/uploads/1/3/1/8/131857213/1165338.pdf
    • https://lekaretuzej.weebly.com/uploads/1/3/0/7/130738752/jelumusaje.pdf
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/7612280.pdf
    • https://static.s123-cdn-static.com/uploads/4501214/normal_6001f07a974ec.pdf
    • https://kuvikupomudu.weebly.com/uploads/1/3/4/4/134457818/1002888.pdf
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/3520692.pdf
    • https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/tonupelexila-bijaf-ribegam.pdf
    • https://static.s123-cdn-static.com/uploads/4484609/normal_5ff1d41db062d.pdf
    • https://dexidexida.weebly.com/uploads/1/3/4/2/134235246/05c74.pdf
    • https://terimigekebala.weebly.com/uploads/1/3/0/7/130738799/wubivof_bapefub_dameras_bemavaravokimor.pdf
    • https://cdn-cms.f-static.net/uploads/4453332/normal_6032b11589295.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fibotemirazopo.rf.gd/fleece_bed_sheets_tesco.pdf
    • http://gebetipuraxos.rf.gd/respectful_workplace_policy_template.pdf
    • http://puzasapexuwuju.epizy.com/xawoturivow.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_off0000e97d.bin
c8d6ce2ef0667159f80fa2156758a81ec01bdc0cc2a894a9859c2b28096b856b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 5076 bytes
font_01_sfnt_off0000fac3.bin
81268f7ce02bf7334c1c9d6a7840a731cb562934cfdf90dd962f8b682db43aea
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC3 10280 bytes