Malicious PDF — malware analysis report

Static analysis result for SHA-256 93032e09d202b668…

MALICIOUS

PDF

76.3 KB Created: 2021-04-20 05:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 791c0f017e6ddb95c72d303957ea4571 SHA-1: f1aac2328011d6ad431337cb8497290393acf2f3 SHA-256: 93032e09d202b668939fe27ab25aaa4b95c20799430c34f96e8a3b52a1931e37
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and a deceptive title suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or conducting phishing. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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=top+5+best+feelings+in+the+world PDF link annotation
    • https://rugibabolunape.weebly.com/uploads/1/3/1/4/131454120/jivejefitewujak.pdfIn PDF document text
    • https://cdn.sqhk.co/suxidixip/fjgiEja/221272083.pdfIn PDF document text
    • https://vakilonote.weebly.com/uploads/1/3/1/3/131382032/4663890.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/hipZhad/balloon_tower_defense_unblocked_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/parapirer/RFoRWZS/88659520206.pdfIn PDF document text
    • https://cdn.sqhk.co/leguzufaju/gMO0bji/assault_fury_mission_combat.pdfIn PDF document text
    • https://cdn.sqhk.co/dufolatik/iy6Hge2/72219249404.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/72c27bf2-6d01-484f-8354-6d8a1de6c33b/zukakixeromugumasuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9f422ca-5d65-4326-8e66-8183c9d58dc9/how_to_reset_roomba_560.pdfIn PDF document text
    • http://debalipusafuj.epizy.com/bugigineverozolaziniwifum.pdfIn PDF document text
    • http://galapeb.epizy.com/sutizekuxotepeganurek.pdfIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_81d0fcdea41945f5943ad0f4a54f6276.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f98ed39-5d4f-4361-95c8-82820f12e231/line_6_hd500x_power_supply.pdfIn PDF document text
    • http://nepogewapiw.epizy.com/csec_mathematics_past_papers_and_answers.pdfIn PDF document text
    • https://e37fb4d6-fac4-4cb1-96d9-cce2dae532e5.filesusr.com/ugd/ed2751_64a244509bae4ed0ae652e7e56c3fc43.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e70b19-5b52-4b3e-ab5e-38a49141c60b/fodebasuwenuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecff3198-036a-4679-b375-2772ebbf37b9/bijubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d1f9ce8-f308-4c9a-ba22-84ceff0ffd90/how_much_do_maintenance_planners_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e05b529e-c969-4b2f-8de8-ea900a2ba972/michael_bennett_books_in_order_james_patterson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3931b2f8-bd38-4925-bbf4-0ae1044402bf/factoring_trinomials_worksheet_answers_with_work.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_off0000e8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A7 5396 bytes
SHA-256: 955d921357628246b75af8c59f4a179279d388f39770b18d73f11cf040a31359
font_01_sfnt_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 12732 bytes
SHA-256: 7a352526df25c62c7b08353694147765ed5966690fdb62e4a9f86340a1303e45