Malicious PDF — malware analysis report

Static analysis result for SHA-256 12481db8ad199277…

MALICIOUS

PDF

76.5 KB Created: 2020-11-24 08:23:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7ada96ea9050735917a571f5f844fff SHA-1: 555ed39102564eb81f6c26fc9362c7725cb6a60e SHA-256: 12481db8ad199277f09b4533b6e433b3663b6bd08b2973a2a6ea1671e0fea9ca
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, directing to various PDF files hosted on external sites. One of these links, 'https://trafffi.ru/strik?utm_term=pathfinder+curse+of+the+crimson+thro', is a primary indicator of malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=pathfinder+curse+of+the+crimson+thro
    • https://cdn-cms.f-static.net/uploads/4377642/normal_5f978e102d0b6.pdf
    • https://cdn-cms.f-static.net/uploads/4417040/normal_5f9a747334d9b.pdf
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/3fcdf1c6133a0e.pdf
    • https://cdn-cms.f-static.net/uploads/4413008/normal_5fb34b2edfb71.pdf
    • https://cdn-cms.f-static.net/uploads/4496225/normal_5fabc052abf74.pdf
    • https://cdn-cms.f-static.net/uploads/4382430/normal_5fafeec915af6.pdf
    • https://cdn-cms.f-static.net/uploads/4411935/normal_5fb2ce3954b77.pdf
    • https://cdn-cms.f-static.net/uploads/4375908/normal_5f8c1861ac68a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c4294bd4-4749-4189-82bb-ca1c0e5ccd23/89856647119.pdf
    • https://s3.amazonaws.com/xakapudakadu/87267458786.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_off0000ef62.bin
63982755f722077e1b1a8b6414aa35369f4bddc0f8b7764fc89847f19396f666		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 5232 bytes
font_01_sfnt_off00010106.bin
9adc8e696a8dfa5dec11c200df40e14e57f204792352c77ea34b80beb64ae019		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10106 10736 bytes

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