Malicious PDF — malware analysis report

Static analysis result for SHA-256 f842a0d3e6a37b17…

MALICIOUS

PDF

90.7 KB Created: 2021-05-07 13:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cfbff3b7a179df37d2148ef65535729d SHA-1: 17e128935728ddc97c15d1560666f9bb82821867 SHA-256: f842a0d3e6a37b17403663d82bd416e24ed2e3fc7c95ca11083d1a8c0b03f518
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm. Several heuristics indicate this is a non-clustered link farm on disposable hosting, with one URL pointing to a potentially malicious domain. ClamAV also detected this file as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious or deceptive content, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=dr+jekyll+and+mr+hyde+movie+2017+age+rating PDF link annotation
    • https://cdn.sqhk.co/lexikegije/aygjHfz/genigamavozemipugizijuzog.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/challenges_facing_african_countries_after_independence.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/gjdgigc/befuxalosotisolug.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/jdicDU4/28013486297.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/al_capone_does_my_shirts_full_book.pdfIn PDF document text
    • https://cdn.sqhk.co/sategexarom/YAjhtLs/cryptic_quiz_math_worksheet_answer_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470221/normal_5fd2a87ef1028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_601212cc8c34a.pdfIn PDF document text
    • http://zaxegod.getenjoyment.net/2006_yamaha_v_star_1100_classic_owners_manual.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/what_does_the_acronym_best_stand_for.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/bujbbv7/oscar_health_careers_florida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459805/normal_6027dee3c05ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_605dc27bd5c76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c11ab09e-384c-4904-8c79-5ef6f38008df.filesusr.com/ugd/7131a6_4f25e2ad5340429e916a4baf408428d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/136a8006-b3a3-4f05-93b0-07b01a30d309/jump_rope_challenge_beginner.pdfIn PDF document text
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_08c3990477834e7eb0d11c7098d5af2d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c39aea56-5a97-4084-800a-32d1421bee79/97075207956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9092b476-8a25-484d-bb72-215f855b6fd7/how_much_for_brother_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74f36a35-0256-4681-af62-e61387103ca2/what_is_the_selected_marine_corps_reserve.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_1102a9cccff64d8e88a2fe2f11ee12c8.pdf?index=trueIn PDF document text
    • https://beea745c-e446-4317-9ad8-fe501d584c0a.filesusr.com/ugd/9196db_13c33943ea784574b275ad473534c2af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7a589dd-7508-432e-95e9-57608e04aff5/ver_la_ciudad_y_los_perros_pelicula_completa_online_gratis.pdfIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_04b43cc16356433993bb8250ce9cfe25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac63cd2-bb8f-43e9-9d73-cd6ed99877ee/77713513059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27056ff0-b6a3-4645-8681-b9e847194566/59312252730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beffe887-24af-4666-84d9-34c915930235/37592642845.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBC 5768 bytes
SHA-256: 932996416c07da4037c85fbfbb81901d4d21d27f980ad5dfb7924088c2273558
font_01_sfnt_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 11168 bytes
SHA-256: ec5396146bbd7f367da6d28b7610a884c9f7d1e6f95a6303a3d8f48dea768d52
font_02_sfnt_off000145db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DB 16192 bytes
SHA-256: b80dcff4b26782ff2bd1ed82e01ce9053ba91b1a5afb9bea673378648d26bec5