Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dfb3c1d7c84b82f…

MALICIOUS

PDF

80.3 KB Created: 2021-02-25 20:25:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ae6022ea4dd13a66cf6542275bb9404c SHA-1: 15f61de60e85ee3485747d696382243129f049a6 SHA-256: 6dfb3c1d7c84b82f0b38b980e8eb998449125a13a2016a00e86ff20de9b5b0a4
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://jottigo.ru/wix?keyword=french+and+indian+war+worksheet+5th+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389095/normal_5fd5f0ced4571.pdfIn PDF document text
    • http://scarcebook.com/megixurizupawnsln.pdfIn PDF document text
    • http://bellissimo.online/vivukoziwasuguratc9445.pdfIn PDF document text
    • http://ig-objectionform.com/rudedisokameviwobutavq2lj.pdfIn PDF document text
    • http://toportt.online/kutetipoluxokc9l4f.pdfIn PDF document text
    • http://maxist.ru/skills_and_abilities_resume_format2ouom.pdfIn PDF document text
    • http://xinupavob.iblogger.org/xavebifujijuduvora.pdfIn PDF document text
    • http://bluhgang.best/detipediwedisodumanerasu55ux3.pdfIn PDF document text
    • http://sacredname.ru/windows_movie_maker_2020_priceokhax.pdfIn PDF document text
    • http://gazzsheff.xyz/hocus_pocus_halloween_costume_toddler5cdgu.pdfIn PDF document text
    • http://springtea.space/zutubeduxapo6ljkf.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/best_onkyo_surround_sound_settings.pdfIn PDF document text
    • http://probmaka.tech/69443262163vc19c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456996/normal_601cba885fd80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baxolorojujore.rf.gd/68215227445.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_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 5404 bytes
SHA-256: 17a5739a5acdedeca55389404ee364c101bc7b8bd1a84396964a72d4e69a7db1
font_01_sfnt_off000110d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 10332 bytes
SHA-256: 1bc4fb8800f52e39370566897fcbf3a59fe96bc09ed67cf8f2581bad4d87fa22

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