Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6ffe2c7baf485c…

MALICIOUS

PDF

72.2 KB Created: 2021-02-17 17:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e68ee0dcc8e4a83443e0886909d449c4 SHA-1: 546360de4a81902cc3b7a5b679b9fb68a62550e9 SHA-256: 9a6ffe2c7baf485c99fa3b7595aecaad779411bda2118c5ba143cce9d28ca366
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a job-related term ('salary for database manager') on a suspicious domain. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The presence of embedded URLs and the link farm nature strongly suggest a phishing or malware distribution attempt.

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 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://baarspo.ru/aws?utm_term=salary+for+database+manager PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381751/normal_602059f8a4329.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/ghgjbVO/boy_hairstyle_long_on_top.pdfIn PDF document text
    • http://vnatural.space/angielski_dla_wiecznie_pocztkujcych_chomikujmjj5a.pdfIn PDF document text
    • http://urott-hu.com/honda_motorcycle_parts_list_australilkyg8.pdfIn PDF document text
    • https://cdn.sqhk.co/laxefotogulo/cLVpxCP/vefibuwilijinupipiposit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476140/normal_5fd7d6f8b6506.pdfIn PDF document text
    • https://cdn.sqhk.co/wenudiwome/hiiajfz/idle_golf_tycoon_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/fexonawizoz/a6hbhax/type_e_with_accent_mac.pdfIn PDF document text
    • http://help-service-support.com/toca_boca_life_pets_apkq4sfc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381321/normal_5fd05c3fe21ed.pdfIn PDF document text
    • https://cdn.sqhk.co/zititepu/Nibuwmr/65483498407.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/funevotehhigx.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/vawoginele/new_winrar_archive._rar_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/osteoporosis_canada_guidelines_2010.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/asl_glossing_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/shiv_aradhana_songs_free.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_off0000dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 5572 bytes
SHA-256: 156c369c2e32f15d8eb31d355a893e7100b7102fb627f201b084e31a612681c6
font_01_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 11136 bytes
SHA-256: db55106df782895b0da873dda9e5b907a1ff466292bda286289fde16e1364c55

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