Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf9e34c154eda99…

MALICIOUS

PDF

77.6 KB Created: 2021-04-02 16:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 41722b9d7b166eba8b7da476a23133fd SHA-1: ef3fe5b597f3efcb2d295d623a8c8d6d9f9a1eba SHA-256: 8bf9e34c154eda999ec0425673a453a3d2000ec44f044132f75eaca3ea8952e3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/strik?utm_term=what+is+prehistoric+sculpture+brainly PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473651/normal_603120145bdb0.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/fpF26Eu/streets_of_rage_2_sega_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/ggt5hg7/bowl._com_smart_account.pdfIn PDF document text
    • https://cdn.sqhk.co/xipapotug/ehgWLja/21353123074.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369507/normal_60373ba3653b1.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejeni/gdS5LZt/xcraft_online_game_review.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/i4V0Mge/bounce_tales_128x160_java_game.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/jeiaHhc/alien_invasion_game_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403673/normal_6060853c298d4.pdfIn PDF document text
    • https://cdn.sqhk.co/wexopaxine/awhiiPp/gasabagokejosomigesodoko.pdfIn PDF document text
    • http://lnstagramsecurity.net/286438076293qreb.pdfIn PDF document text
    • https://cdn.sqhk.co/jijatidos/fBThejf/sudoku_solver_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/seruribemoju/k5xhgZl/meteor_shower_lyrics_meaning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_0a78eaf830794ee39a7116bdc6ad1608.pdf?index=trueIn PDF document text
    • https://a134ef9b-a212-4d8e-a35f-da3d896bbd40.filesusr.com/ugd/dadc92_dd774a33d3144d56b4976aaf506ff3db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/003ab13f-743a-4d7b-a0b4-6d68c38ee321/57617949181.pdfIn PDF document text
    • https://9f4ad419-87ad-4507-9b23-40b7c7395cc9.filesusr.com/ugd/55478e_1a674d9e78724eda86e5875f6bebca05.pdf?index=trueIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_4d68eeb7fab94c6a90b0bba7e814fc50.pdf?index=trueIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_e0ebc9663d004e6cbac074da70061062.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0adc2647-174a-47ca-84d6-cbf1d6174e5d/phb_school_result_2020.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_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 5276 bytes
SHA-256: a77417ba015341d222464ddc48c57e46ab293c780470a79d29493b54db986d7b
font_01_sfnt_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 10484 bytes
SHA-256: 25fe930d774bdee98647cc8ee9d0d373d7188189f47995196f037d9f5b65451a

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