Malicious PDF — malware analysis report

Static analysis result for SHA-256 71125697daab1a77…

MALICIOUS

PDF

72.7 KB Created: 2020-11-13 14:04:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d04b1e5155cd1678e4a675e82d5ae0b0 SHA-1: 1a23e40d0d21b3fc1895628f54f693a28598581a SHA-256: 71125697daab1a77bbd3c9d162e8d2a8415c6e30c04f6e2bc4ef5846726f82ed
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. One of the embedded URLs, 'https://traffset.ru/123?utm_term=black+german+shepherd+breeders', appears to be a lure, while another, 'https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/8279037.pdf', is part of the link farm.

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-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://traffset.ru/123?utm_term=black+german+shepherd+breeders
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/8279037.pdf
    • https://cdn-cms.f-static.net/uploads/4369777/normal_5f8805f07af4c.pdf
    • https://josugonu.weebly.com/uploads/1/3/4/4/134488469/8610260.pdf
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/pomusujijiloz.pdf
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/zexekunimisetidif.pdf
    • https://ponikinofenad.weebly.com/uploads/1/3/4/6/134602628/747fef0de83.pdf
    • https://joleziravakejar.weebly.com/uploads/1/3/4/4/134460301/kuguw-jijagonogamoz-jokugipokimiduz.pdf
    • https://cdn-cms.f-static.net/uploads/4464700/normal_5fa856abbaf1e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/webipejonavuv/m_m_math_worksheets.pdf
    • https://s3.amazonaws.com/jifesu/thee_midniters_greatest_hits.pdf
    • https://s3.amazonaws.com/fasanag/learn_autocad_2007.pdf
    • https://uploads.strikinglycdn.com/files/758024c3-e58d-428c-bf3e-bdaccabd8893/mubiniwoxajuse.pdf
    • https://s3.amazonaws.com/xukonakefules/koxunitejubuxufenaxo.pdf
    • https://s3.amazonaws.com/vobuturinivi/putagirigofodavemuxo.pdf
    • https://uploads.strikinglycdn.com/files/b40db56d-7e0a-475c-bf45-ec005446a9d9/half_value_thickness.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_off0000dc45.bin
53998434a31661710f7e13f962f7869af624fe2292cea7830a18710ca819c02b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC45 5740 bytes
font_01_sfnt_off0000ef9a.bin
420be95fa5679bbdcb829d4ac0d07c9cf2739a61ac36edba836866e51e041aa1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 11320 bytes