Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd53a80085f03be…

MALICIOUS

PDF

72.2 KB Created: 2021-03-29 03:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 460dfe5b7e9c702c21e54877767b9e0d SHA-1: 9f816bbb9c15dfca91fdcab1e7a42bac7b35bae6 SHA-256: bfd53a80085f03be480f86501ffdb0d638fbaf493e43886e2d2a0009ec5cb4fe
126 Risk Score

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-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://lozipotod.ru/award?keyword=rental+agreement+format+in+tamil+pdf+download PDF link annotation
    • https://sibemawiwojaro.weebly.com/uploads/1/3/4/8/134887292/f0a05.pdfIn PDF document text
    • https://cdn.sqhk.co/sokulutesi/f2Mjfhe/74235211601.pdfIn PDF document text
    • https://cdn.sqhk.co/lowilufape/KLhjjcH/basketball_scoreboard_program_free_download.pdfIn PDF document text
    • http://lozepamubi.iblogger.org/xomovigewesetitoverod.pdfIn PDF document text
    • http://vasamekekegu.iblogger.org/33124970149.pdfIn PDF document text
    • http://nezatarofarix.getenjoyment.net/3097405760.pdfIn PDF document text
    • http://rarurude.22web.org/80550503676.pdfIn PDF document text
    • https://tapukupe.weebly.com/uploads/1/3/4/7/134717462/nutalukakase-mewopodu-nukasi-kidexefer.pdfIn PDF document text
    • https://ralawuxageg.weebly.com/uploads/1/3/4/3/134319431/6a76d3a4d7.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/test_angielski_poziom_b1.pdfIn PDF document text
    • https://cdn.sqhk.co/tepikipo/digFhgS/dosixikebepanodimijeka.pdfIn PDF document text
    • https://zemizipip.weebly.com/uploads/1/3/4/0/134098502/9864470.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zunimesigo.rf.gd/70068184493.pdfIn PDF document text
    • http://xisuwujilaxemer.myartsonline.com/29826700.pdfIn PDF document text
    • http://gonuwufif.epizy.com/59336148481.pdfIn PDF document text
    • http://fuvogel.rf.gd/pdf_calendar_2020_calendarlabs._com.pdfIn PDF document text
    • http://pabotojixupi.atwebpages.com/abstract_algebra_questions_and_answers.pdfIn PDF document text
    • http://tikeresepujel.onlinewebshop.net/rujelepaninafale.pdfIn PDF document text
    • http://welavozolin.rf.gd/jeopardy_sheet_music_trumpet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC9 5068 bytes
SHA-256: fea473d0d7dd1f147ffb7a3b425894081bf5a545f80179192e3c6367cefbae74
font_01_sfnt_off0000e0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 10540 bytes
SHA-256: 05b7fe8592d101566681126b690de9f297360c599373979c0d7ff679b03e391a
font_02_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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