Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a9855e12ee3bb5…

MALICIOUS

PDF

76.1 KB Created: 2021-06-09 17:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8f0f78ae307d1a39fc3dbb72d7aa5810 SHA-1: cf0d745e272c0a9055a025121bfb379f21039f33 SHA-256: 60a9855e12ee3bb551c48e9e85d2c1acd6ac3d6e9d45cab4059f88e392e98640
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'infrive.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's structure is designed to host multiple links, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://infrive.ru/pbw?utm_term=present+progressive+tense+exercises+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499972/normal_5fd9891171fc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370080/normal_606b719fa4d5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496170/normal_60646ed1a4ab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_605618d6d75d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501356/normal_60bc3a31c2ee9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wusagem.pbworks.com/f/does_an_eno_come_with_straps.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144706716/wolepubiwelid.pdfIn PDF document text
    • http://sozevupegufi.pbworks.com/f/17812289876.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/f/find_owner_of_vehicle_by_vin_number_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c263713d-c9bb-4b44-9a89-b3c0e9b4e0a9/simile_and_metaphor_worksheet_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/426e2408-f89c-43b1-b1e3-17edcfd149d3/filup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d6a7b8d-dd43-4469-bc91-e23dc0051515/zopunes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5754c08b-e5cb-4d03-9f32-8b612882163f/73860026387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60bbe6ce-0dea-4a60-a62b-091effce638d/the_endless_game_movie_rotten_tomatoes.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/f/yaseen_malayalam_meaning.pdfIn PDF document text
    • http://vikiruji.pbworks.com/f/gozuzenazezifupekujod.pdfIn PDF document text
    • http://voluluzij.pbworks.com/f/thiruttuvcd_english_movies_dubbed_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/073bfd65-56fd-4433-8b3d-18ea83263b3b/bogolalojawa.pdfIn PDF document text
    • http://kuduwoxux.pbworks.com/f/utiliza_las_relaciones_trigonomtricas_bsicas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f9e4c9-a071-4416-a1a7-81705f72a466/27851601025.pdfIn PDF document text
    • http://xetuduju.pbworks.com/w/file/fetch/144677448/92683876454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1f586d-e538-4845-bf85-07b0921645a7/wijozepenevakatido.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/f/republic_ez_spreader_manual.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_off0000e981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 5208 bytes
SHA-256: fb58955cb884799c78fd84336ad040a6ac844da925516fb37b7e5887901a5c84
font_01_sfnt_off0000fb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 12120 bytes
SHA-256: 0681504e22b38ab5f376c5c8f864d87b0ac83674d6eae7418e8a0bd42a19b1ec

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