Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9cf4b47fe7cd2a…

MALICIOUS

PDF

74.4 KB Created: 2021-02-15 17:51:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: a466f7584d8079add819cd1d7842a429 SHA-1: 289f6ff50b77232b6de08704f93ea3fa379d876a SHA-256: 6b9cf4b47fe7cd2a0868acb5a4214ce60a2d49688f86d57c3e4af75ed597d191
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains or file-sharing services, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://leonvi.ru/wb?keyword=how%20to%20fix%20a%20hunter%20thermostat PDF link annotation
    • https://dojiladise.weebly.com/uploads/1/3/1/3/131379401/wavaronuxog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452850/normal_6006990d73b81.pdfIn PDF document text
    • http://psychologyrelax.xyz/4543888333884zec.pdfIn PDF document text
    • https://tasitonedilegu.weebly.com/uploads/1/3/5/3/135301248/teriwexulaza-bovefosamafas-lokawofud.pdfIn PDF document text
    • http://sodalabs.pro/refidilurupubof0hqs.pdfIn PDF document text
    • https://tunuwadubozowe.weebly.com/uploads/1/3/4/3/134363043/zawemowebejema-jonaje-romadupopu-jated.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_6018647f5a5c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411228/normal_5feec19a2be73.pdfIn PDF document text
    • http://priz24.site/89469612160pji8a.pdfIn PDF document text
    • https://xidokuwu.weebly.com/uploads/1/3/1/4/131453793/cd237ab26522.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/102236.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/venamugusajiraj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391308/normal_5ff56a2f23b4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387816/normal_5ff532205052e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 5096 bytes
SHA-256: 3e123aa69b568c2036492bd8d0a9b313670c906855e14d9ae7992efa6f3fa3f4
font_01_sfnt_off0000fa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 10192 bytes
SHA-256: c6138cfb36635022fc12165cffc791ebadeb0c3d21a2e8ee5eece72c6f6d3e22

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