Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c32d1fdbbb5be25…

MALICIOUS

PDF

73.5 KB Created: 2021-03-27 23:13:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 699910b17fa7ef47723a3afc811390aa SHA-1: 9242ebb27cc9cf23dbbe8e35d6e45641a27aa117 SHA-256: 8c32d1fdbbb5be2537f51455185849c37db4145d837ebe910dacf13a80978687
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 domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The ClamAV detection further confirms its malicious nature. The primary function appears to be directing users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/123?utm_term=galvin+green+paclite+size+guide PDF link annotation
    • https://cdn.sqhk.co/sogunixe/idDrRhf/in_car_parking_games_prado_new_driving_games.pdfIn PDF document text
    • http://baderezu.scienceontheweb.net/my_diary_quotes_images.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/11105722523.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/Ogeibv0/12524789501.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/gdzrudK/nba_now_mobile_basketball_game_mod.pdfIn PDF document text
    • http://bebalezuve.medianewsonline.com/the_practice_of_public_relations_11th_edition_free_download.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/5285b4d8-03c9-46ad-8ce6-5dade46692ee/mr_coffee_optimal_brew_12_cup.pdfIn PDF document text
    • http://butorinowu.myartsonline.com/what_do_birth_chart_placements_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42b52a11-db9b-4c20-bb2c-1c343f2f0caf/what_are_the_voiced_and_unvoiced_sounds.pdfIn PDF document text
    • http://movasedumanepe.onlinewebshop.net/catalogue_automatisme_schneider.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/569649c1-106d-4db6-8ffa-06273a4b511e/zabarujipobejovawapuxaba.pdfIn PDF document text
    • https://034b020c-baab-45d1-b3ff-c950d21f9178.filesusr.com/ugd/3c93bc_7db65104eb2b4b01885df3960fe10384.pdf?index=trueIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_a1a727ef5d19487cb2cb0903bba3c82a.pdf?index=trueIn PDF document text
    • http://tososite.onlinewebshop.net/mokegoful.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8664e0f7-bf53-4c13-b3a6-db9970cef3ee/kudizomuvas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b0cf7f3-9526-495d-9f91-752c4c1ab2ee/sword_art_online_light_novel_better_than_anime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/722c2f4b-9ac9-4f90-92fd-9ff5cbb0857c/folowipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4ade5fc-5d9a-4754-8013-f4fcfa730132/korean_alphabet_a_to_z.pdfIn PDF document text
    • https://4f640d82-8365-4c22-93d6-dbd3427c3fb0.filesusr.com/ugd/55e8b7_003b3423530440b99d4406214c89a9a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d34d37f-2c90-4bc1-9925-f3d9c9ace2e4/8710115442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e280014-385e-4307-a92b-0e23c0843531/lenovo_battery_not_charging_windows_10.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_off0000dffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFC 5384 bytes
SHA-256: 71268a9a0b59b471f4cc7ba2e37491c8836c7c5a3b91fb27e373774953894e9d
font_01_sfnt_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 11224 bytes
SHA-256: 9f727d102efcbad71ebc9dc8f84efe107cb44b679cea220ff92fc6780f4fe26e