Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc5c51bca575417…

MALICIOUS

PDF

76.5 KB Created: 2021-03-26 10:31:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7284b1e4cfae6b19672c4e475250a2a0 SHA-1: 92f00aadbf8254f361da40a061281989a7168341 SHA-256: 2fc5c51bca575417f0c1de8fa9f7704b4b229061d3ebcab16593bbe6533e4711
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/strik?utm_term=what+is+the+main+theme+of+the+masque+of+the+red+death PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488581/normal_5fd6751269eb3.pdfIn PDF document text
    • http://lawyer-consult.ru/lomivunogiwivokoguwawd06z.pdfIn PDF document text
    • http://wisecreditscore.info/5168685837eex4z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453754/normal_5fc5cd0c75024.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447258/normal_5fe57f3071641.pdfIn PDF document text
    • http://khanapoorti.com/kozesivonebufazajg95r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374688/normal_5ffa503cc8ce4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_605bfcd75d4ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501486/normal_6015aa27272b6.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/cRezjdx/company_of_heroes_2_steam_api._dll.pdfIn PDF document text
    • http://tizezs.xyz/aerial_silks_performance_songsxjqnu.pdfIn PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/gccfigO/dino_t-_rex_hack_apk.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
    • https://d429d46a-6203-486b-8c9d-ede5597e1383.filesusr.com/ugd/419b00_01bcbe1c26774b9881eb61b4aff00280.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_f6465fdc1ac34cad9fa4ebdcf37e8cf7.pdf?index=trueIn 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_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 5136 bytes
SHA-256: c0b1b39ddb16925f2ac7e88b941bcb898d439355fd01d55be2edb0452386ec7b
font_01_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 10852 bytes
SHA-256: 0e0c3b4debd0d2dc66510a2e71667c214713801ca2f0ad1b02c4d0b6c7d17036
font_02_sfnt_off00011658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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