Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85ec0ae47d3ba4d…

MALICIOUS

PDF

70.3 KB Created: 2020-11-18 01:47:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94313ae827063a531ba9e5eec33cf2b1 SHA-1: d18bc13b5a9fe6d64d684d639a42b291ed7b45a7 SHA-256: b85ec0ae47d3ba4d0bedf58aa9db95b9609c1673fdced86ab33ce16945c62a6c
214 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by multiple heuristics and a machine learning classifier. It contains a significant number of embedded links, with one pointing to known malicious redirector infrastructure and others forming a link farm. The document body is heavily obfuscated, but the presence of numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/aws?utm_term=email+cover+letter+format+pdf
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/lenazosetuva.pdf
    • https://cdn-cms.f-static.net/uploads/4408991/normal_5fa285ab360b0.pdf
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/gifavexosubuduxene.pdf
    • https://cdn-cms.f-static.net/uploads/4379971/normal_5f95f784c1a07.pdf
    • https://vodoxakitukep.weebly.com/uploads/1/3/4/3/134335140/sujojaredudale.pdf
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5f8a7a3ebd50a.pdf
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/7784349.pdf
    • https://cdn-cms.f-static.net/uploads/4490720/normal_5fac31922c7b3.pdf
    • https://cdn-cms.f-static.net/uploads/4369928/normal_5f911ed5ab0a9.pdf
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f9b0ef5e6dfd.pdf
    • https://cdn-cms.f-static.net/uploads/4385848/normal_5f8d2bbe43669.pdf
    • https://pejilajapife.weebly.com/uploads/1/3/4/4/134477767/28876398190ff1.pdf
    • https://cdn-cms.f-static.net/uploads/4464314/normal_5fa32c518218a.pdf
    • https://mubatizusilaboj.weebly.com/uploads/1/3/4/4/134475350/bejotunibemomu-bosewilarigud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d7c0.bin
44760f1d05543ab04930e85ee6ba7acb48e4b0e6d9ce499c67bf26fdf8fe1138		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C0 5140 bytes
font_01_sfnt_off0000e931.bin
816e529271ffff7e4c789d2b3d0ef53831fa95ee790a13626e55cad3976377dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 10544 bytes

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