Malicious PDF — malware analysis report

Static analysis result for SHA-256 6632fe389a70e96c…

MALICIOUS

PDF

82.2 KB Created: 2021-01-30 02:47:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c469e9cdfec948d5524293268e2b84d5 SHA-1: dbf006ea90891e101fc18e00dc0e7518d50edb77 SHA-256: 6632fe389a70e96c4a78be8fa7d3b9a3f12bc4bb4bfd490fae132567cd8ac671
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, one of which is 'baarspo.ru'. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of numerous external URIs and the link farm heuristic 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/123?utm_term=big+dogs+clothing+store+near+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414860/normal_601048d8c088b.pdfIn PDF document text
    • http://wtia.space/partido_unico_de_pendejos2r1r7.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzezajolu/aOqU6hb/segivigixezifakiwelirebo.pdfIn PDF document text
    • https://cdn.sqhk.co/renerolodepu/JOjhihc/somalod.pdfIn PDF document text
    • http://infokurs.design/9076027297vi5tr.pdfIn PDF document text
    • https://cdn.sqhk.co/jilijibimi/jfvmbLy/1st_grade_activities_on_zoom.pdfIn PDF document text
    • http://vorgazme.com/acog_practice_bulletin_no._209_obstetric_analgesia_and_anesthesiacyjyi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464534/normal_5fdf6356e5599.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386606/normal_5fc698487b7c4.pdfIn PDF document text
    • http://file-id.ru/formula_1_live_timing_espnr087s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5fe9fc7fd120a.pdfIn PDF document text
    • http://yoganchik.space/kvs_admission_6_class_2019_online9kul4.pdfIn PDF document text
    • http://girlsbeach.space/naruto_jiraiya_tsunade_vs_orochimaru_episodewwbeg.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/lhaxEPD/19850964299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388158/normal_5fe81065650bf.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/norozovijalu/hospital_bed_sheets_amazon.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_off0001050f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 5400 bytes
SHA-256: 8139ff29c295c17d4f24f042183392a50d4defb995263f397f20cc2e07138a69
font_01_sfnt_off00011747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11747 10904 bytes
SHA-256: 163437f4a7086a8eae0a5fa53161f281fd7bf701e60e53462356a1ec5531c531

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