Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad2f4d107f57552…

MALICIOUS

PDF

83.2 KB Created: 2021-04-02 02:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 042fcebe1da3c37a6c9db8875d67a615 SHA-1: 809950ffd6aa4df85c192345c20ec8a5541a92bd SHA-256: cad2f4d107f5755250e34d5a58c5ae30d1299f5fb47f2e7dca133772b32deca4
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive content, aligning with spearphishing tactics.

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://mezovuduw.ru/strik?utm_term=how+to+start+learning+engineering+drawing PDF link annotation
    • http://gibelineg.sportsontheweb.net/koxufowakunatered.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479684/normal_60246f12abad6.pdfIn PDF document text
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/229601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414851/normal_6049ce25d3f8a.pdfIn PDF document text
    • http://apparently-home.com/ios_13_for_iphone_680mcy.pdfIn PDF document text
    • https://pudakivofuleges.weebly.com/uploads/1/3/4/8/134853743/fofujokem.pdfIn PDF document text
    • http://tur8osale.site/3_rules_for_writing_scientific_namesuj4b0.pdfIn PDF document text
    • https://pojojozujivalim.weebly.com/uploads/1/3/1/1/131164399/c741d72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369327/normal_605d59a63d9a6.pdfIn PDF document text
    • http://arenaprobet.com/the_importance_of_being_earnest_character_analysis5a9kp.pdfIn PDF document text
    • http://esmoney.site/982915142796zryu.pdfIn PDF document text
    • http://huaweistoreukr.xyz/what_do_you_understand_by_food_chain_and_food_web62mp2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0e8ba6f-d0aa-4a7e-bb03-cdbf5fb6ae71/robert_dahl_democracy_and_its_critics_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349632b5-fe2e-4735-9766-7874b548a9ff/1270845570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fe101ad-cf78-42ff-9d74-2605fbde2ebe/2005_honda_odyssey_leather_seats_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/63744705245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f46cd399-e841-461b-b36a-3ae7fab7094b/9369750708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a7a8261-7e1a-437e-b5a4-3a4e0e4f5f85/what_do_different_tattoo_symbols_mean.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/nuwasewubage.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/bleach_brave_souls_apk_9._2_3.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_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 5044 bytes
SHA-256: 1a225eec7a8ba0c150e7571f75d44c057bee5b64dc79eb96855ef7c37d75103b
font_01_sfnt_off00011af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 10716 bytes
SHA-256: 394cf17c508bd561de3611cffba575958bcd8ef595e8a475900fd864196a646b