Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff8a095d145f659…

MALICIOUS

PDF

71.3 KB Created: 2020-12-29 13:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6357a96713af3421712a36b01eeb3776 SHA-1: 1d6d36b85b02e85a5f9f154904d3b9caf2eb3b2c SHA-256: 0ff8a095d145f659126963ffb71186a31fa8b4de5a1768b980053464c1d57d9d
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or phishing campaign. The primary URL, 'https://trafftec.ru/strik?utm_term=ok+live+video+live+stream+app', is likely used to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/strik?utm_term=ok+live+video+live+stream+app
    • https://cdn-cms.f-static.net/uploads/4387419/normal_5fa8465b6d6bd.pdf
    • https://cdn-cms.f-static.net/uploads/4417534/normal_5fc1f17241356.pdf
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/gixoximedapim-xebetirawunaz-woxodilofafil-gedadipukemud.pdf
    • https://static.s123-cdn-static.com/uploads/4417530/normal_5fce010a8ca27.pdf
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/duberumelaso.pdf
    • https://cdn-cms.f-static.net/uploads/4446152/normal_5fb48b12e9acb.pdf
    • https://cdn-cms.f-static.net/uploads/4381529/normal_5f9448d3c3f8e.pdf
    • https://static.s123-cdn-static.com/uploads/4454558/normal_5fe05e11860e6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/001893ac-c17b-47f7-9e65-7fcf2759f643/derabakirivofiponawog.pdf
    • https://uploads.strikinglycdn.com/files/6c2134b9-5476-4832-bcc9-f079c6d3883c/44160013377.pdf
    • https://uploads.strikinglycdn.com/files/9da10ecc-1978-44a6-b093-d129d3db781e/misiterilenuvotowirajol.pdf
    • https://uploads.strikinglycdn.com/files/38972d62-58ba-444f-8918-34ed17f17f34/jikoferin.pdf
    • https://uploads.strikinglycdn.com/files/b5a34f8f-18a3-40f7-af5b-db39a9cccd45/36286800762.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_off0000dc73.bin
b8e57049738fd2604c85dd58a27c6fcd4e26719d61f49f47abbc22643a9ecd33
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC73 5256 bytes
font_01_sfnt_off0000ee44.bin
56fc6e52cfe976cc1e83c71f8f5bcb62477b3cddb400270914ee58c2b5259426
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 10024 bytes