Malicious PDF — malware analysis report

Static analysis result for SHA-256 8674065dab8c7595…

MALICIOUS

PDF

64.5 KB Created: 2020-11-10 07:40:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9280ef857c3904b22631301e80f61efd SHA-1: d474c32047448a7ba1ca08d462f7287ae01b6768 SHA-256: 8674065dab8c75957ca1451fc3fca6f6d2dfdbbd22357ab698defafaed70341a
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a large number of external PDF links suggestive of a link farm. The 'SE_MFA_LURE' heuristic strongly suggests a credential phishing attempt, likely to harvest MFA codes or session tokens. The embedded URLs point to infrastructure commonly used for distributing malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://gettraff.ru/strik?keyword=play+apk+on+ios In PDF document text
    • https://juvikenozenukun.weebly.com/uploads/1/3/4/3/134322787/6995052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421058/normal_5fa7da37cc771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_5fa12b879819a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_5fa0193608b0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381083/normal_5f8f09d05b744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370762/normal_5f8cfd397faef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_5f982cebb73c7.pdfIn PDF document text
    • https://zoxetojasag.weebly.com/uploads/1/3/1/4/131437223/vokokas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a334cb6e-e9a3-492b-9edd-f5e7052cf9a4/23910027092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a334ec04-0eaa-417e-b545-cc652ecc30cd/beginners_guide_to_brewing_beer.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/dl_1275_ticket_dispenser_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28B 4884 bytes
SHA-256: a397b679a48db74c23bd65970fe8dd34d29b8916139f604b9f70902694635340
font_01_sfnt_off0000d345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD345 10128 bytes
SHA-256: cbbfffabbf4b574667bd6d51df84740ff1445036c3d4e67248deea7f3b78656e

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