Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb20e75358babb3…

MALICIOUS

PDF

81.2 KB Created: 2021-05-28 21:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6d45c63829e172c1114b1b8303594e6d SHA-1: aaa9853fba097a9fe4cbe0d2b9fd8471ba318c62 SHA-256: 8eb20e75358babb37e466f93e3ad40140cce029e12b6e78e5d5764bf0ef0756e
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create documents for web content. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://yafferge.ru/strik?utm_term=do+you+always+capitalize+the+word+president In PDF document text
    • https://static.s123-cdn-static.com/uploads/4409421/normal_5ff80fcb87ad0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450042/normal_603d178a8ed2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_6032d89f5572e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391623/normal_5fdcd543ea292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370304/normal_5fd2e862efdc4.pdfIn PDF document text
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/4802926acf64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413368/normal_5ff57d87d9ebb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472775/normal_600ab6a5812af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_60167d33617cd.pdfIn PDF document text
    • https://zegadakupoxak.weebly.com/uploads/1/3/4/7/134749069/butusen-tulabetefobaf-tilupomixap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_600d8aa967545.pdfIn PDF document text
    • https://birakegisepes.weebly.com/uploads/1/3/4/5/134597855/sawizurufube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459060/normal_603df82f7d518.pdfIn PDF document text
    • https://zeburunonuf.weebly.com/uploads/1/3/4/4/134458398/11a294446ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412582/normal_6013714527902.pdfIn PDF document text
    • https://nometiru.weebly.com/uploads/1/3/4/3/134379396/ed9ca566.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 5288 bytes
SHA-256: 729bee38943c37e3e5939875310d6b30d87076f5f800566349b78a8410ce03c0
font_01_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 10740 bytes
SHA-256: 0e22e3fc67def46677aa5e598fc9481ecc752d47dcfcfe052481c10a7a1bccf3
font_02_sfnt_off000129cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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