Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24cba460144addd…

MALICIOUS

PDF

75.2 KB Created: 2021-03-19 20:08:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 82782a4a2b1c26bd42a4101d5a76baa0 SHA-1: decda441ebfd949cc1de7fb1a6481d817671bc5f SHA-256: b24cba460144addd931c57c63769cf24c9d8cacea94e9c3f012f9503895ee75e
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, identified as a 'PDF_SEO_LINK_FARM' heuristic, with the primary suspicious URL being https://resalured.ru/strik. The document body is heavily obfuscated and appears to be generated content, likely intended to mask the malicious nature of the link farm. No scripts were extracted from this sample.

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
  • 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://resalured.ru/strik?utm_term=what+kind+of+oil+champion+generator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425738/normal_60372b8f81a9e.pdfIn PDF document text
    • https://baxemajoxololur.weebly.com/uploads/1/3/1/0/131070692/gibaduxovagodutiji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_6047d60f06f6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382961/normal_60016de97ed47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469837/normal_6051c095c802f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_602d25d37ac46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376858/normal_5fe9886b121f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463533/normal_60296f7f84109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504047/normal_6029fdf35b2b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454967/normal_5ff8a1952aea4.pdfIn PDF document text
    • https://sazotavivi.weebly.com/uploads/1/3/1/1/131164406/6804278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485579/normal_604361c0a9afe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_99f57997e7574cecaa1592125b9338b6.pdf?index=trueIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_ae912102007b4670a8848541cc9274e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votawawo/kindergarten_subtraction_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/alto_s_adventure_zen_mode_piano_sheet.pdfIn 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_off0000e8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 5468 bytes
SHA-256: bcf69d5863619eccb9df249301c26c1831f28500da33544f0b57e3adcb41a68a
font_01_sfnt_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 10752 bytes
SHA-256: fd3c3a1e3ec021b904a0cd9232eba7b40f32a417a3194417d9a3193dc25b00ec

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