Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fb68396fc85b5f…

MALICIOUS

PDF

71.8 KB Created: 2020-11-24 10:14:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 927ec24a20ac0005a8209b64621b829d SHA-1: 755d017399467f51af7947622ad67cd2c6279562 SHA-256: 78fb68396fc85b5f904031432383113098a36860684d4cc479f00abc9706da24
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains heuristics indicating it's a malicious phishing document designed to trick users into disabling security software. It also includes a link farm and an embedded URL pointing to a suspicious domain, likely for delivering a second-stage payload. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/strik?utm_term=league+of+legends+won%2527+t+open
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f87419009597.pdf
    • https://getesuvuroxabet.weebly.com/uploads/1/3/4/4/134403663/govorazabexuwunefaba.pdf
    • https://cdn-cms.f-static.net/uploads/4378836/normal_5fafdf7cea98c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4b7f3db7-201d-4b06-9efe-68cb8396adcc/33515568118.pdf
    • https://s3.amazonaws.com/dinigugaxej/46298209500.pdf
    • https://s3.amazonaws.com/mazugezijap/nupotuniz.pdf
    • https://s3.amazonaws.com/sigobija/15877439052.pdf
    • https://s3.amazonaws.com/vixuwogetiv/chemistry_a_molecular_approach_4th_edition_solutions_manual.pdf
    • https://s3.amazonaws.com/fotojipifuzitul/angry_mood_off_whatsapp_status.pdf
    • https://s3.amazonaws.com/lepefi/theological_books.pdf
    • https://s3.amazonaws.com/kexamoxusinixu/41698802031.pdf
    • https://s3.amazonaws.com/jowutoneranemuk/jiwasa.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_off0000dc61.bin
b221eb7993b89cc23e9be5409d3712a2961b0db08f3f3949653dc438cf7d4b73
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 5180 bytes
font_01_sfnt_off0000ee3d.bin
34b5d819f38e316e0cb67333f28583e8687d46bb1bedb13af386f25247e067f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 10716 bytes