Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63cb7231d623248…

MALICIOUS

PDF

75.3 KB Created: 2021-03-29 16:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0f08deb37c642ea97ddfb07391a5bcad SHA-1: 5a7f4592d25fbc772e6c5997ac668ba3b1282c7c SHA-256: d63cb7231d62324834cb678186ec5bf0c86a7fead2b3533fb416c786bc3211dc
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 0.9998

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 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://bologen.ru/award?keyword=mustang+assembly+manual+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471686/normal_5fcf38fbe17eb.pdfIn PDF document text
    • http://mklhhhh.space/gonizulefurejewino6z9ts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379605/normal_6059ce886739a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469828/normal_6011b63ba1f7a.pdfIn PDF document text
    • http://sumodena.getenjoyment.net/yesterday_beatles_chords.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476434/normal_5fca2460b9d07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391611/normal_6005a7f139b1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471081/normal_602886915d5e4.pdfIn PDF document text
    • http://richmaya.site/yamaha_rx-v377_specse4kgc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448347/normal_5ff50dc6ad4b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501364/normal_600a1737b2219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452624/normal_5fd96d472752c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426832/normal_5fc919697d0d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_60145d2ac098a.pdfIn PDF document text
    • http://letabumo.getenjoyment.net/piwisitomebaneno.pdfIn PDF document text
    • http://douchehq.xyz/patton_heater_puh680_not_workingbuwg5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sejakopa/60355811586.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/commando_2_full_movie_video_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/66015500485.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_off0000e74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74C 5512 bytes
SHA-256: c3657e6cb403ac3b02e179a9b60f29294c0c6bdb80270f85452a6e238ab2c2b0
font_01_sfnt_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 11164 bytes
SHA-256: c1ab0f9aeb15496ea612cde4a8e5d85a30a2b9558f4487abcd75420a6e9f8db3

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