Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1158064d735bc13…

MALICIOUS

PDF

74.8 KB Created: 2021-04-07 03:40:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f1f01a4f83236e750f043cfe6288e6b3 SHA-1: bf03a2234efc0e8f81d1c53e8bfcfa5f88948e7f SHA-256: c1158064d735bc131b45e9a4ca5e1fab58f62fe64364e0b5f0f81564fe0edc76
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, with at least two identified as potentially malicious link farms, suggesting a phishing or malware distribution scheme. While no scripts were extracted, the structure and embedded links point towards an attempt to redirect users to harmful sites.

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://fokemale.ru/award?keyword=conjunctive+adverb+worksheets+pdf PDF link annotation
    • http://oneitstore.info/2058426932vx60z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474223/normal_5fd2633bd766a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393361/normal_6039fe2f7275c.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/59724196409hoboe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446494/normal_5fef1ae5d1653.pdfIn PDF document text
    • http://eeuuurrrrr.space/dashavatar_cartoon_movie_video_songs_freegdgt9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472488/normal_6002a6658e19d.pdfIn PDF document text
    • http://dobewobezusisof.iblogger.org/free_fire_battleground_offline_game.pdfIn PDF document text
    • http://voztrans.ru/montherlant_les_clibatairest51v8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://devoleresi.rf.gd/induction_motor_protection_system_project_report.pdfIn PDF document text
    • http://mosebokolerer.epizy.com/lutekenufomuripopireb.pdfIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_46d70c1c2f8e4a9ca9656e84012f1774.pdf?index=trueIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_b0b5e762309e4342b7d1e385479f0fb6.pdf?index=trueIn PDF document text
    • http://kezuxitejapub.epizy.com/58976557386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b98cbdf9-74c1-4566-a621-88379dc17d64/76210321529.pdfIn PDF document text
    • http://kavafaj.rf.gd/the_economist_2020_free_download.pdfIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_6c52f8bc55ef48a59df9179ef7619d35.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba8d147-2a4e-4db3-831e-f5f49e3bff94/zuboramaxubuzaselozegoxor.pdfIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_2414142d669f42d8ab194ab33c99bd04.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 5548 bytes
SHA-256: aff737dafac5dce71aaefaf95fec5bd003b040e3aa2545eb7e3a15041f16441c
font_01_sfnt_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 10912 bytes
SHA-256: 7c659cd7903104af7a84897b500709e0a95eb6e521f317433da35caa25d6e3b1

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