Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b8ccfbab2e8983…

MALICIOUS

PDF

66.8 KB Created: 2021-01-24 05:58:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7792752fb8619a1b8187304e8346aad0 SHA-1: 1ef99efedbc1c8b410a9554ac96d35300a0e5672 SHA-256: 45b8ccfbab2e898317767d72f1ff009ea56b7e93490b404632edc9c86fe6dd2b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as 'https://traffset.ru/123?utm_term=gum+wrapper+origami+star', are likely used to redirect users to phishing or malware-hosting sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to exploit users through malicious links.

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://traffset.ru/123?utm_term=gum+wrapper+origami+star PDF link annotation
    • https://cdn.sqhk.co/doxowite/ciashfr/star_picket_fence.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_5fe94eb4a8e56.pdfIn PDF document text
    • https://site-1245429.mozfiles.com/files/1245429/full_metal_jacket_imdb_parents_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/jhjeHge/mario_kart_tour_event.pdfIn PDF document text
    • https://site-1172223.mozfiles.com/files/1172223/plastic_ke_bora_bhojpuri_song.pdfIn PDF document text
    • https://site-1180361.mozfiles.com/files/1180361/43848438115.pdfIn PDF document text
    • https://site-1177303.mozfiles.com/files/1177303/inside_out_anger_meme_generator.pdfIn PDF document text
    • https://site-1225924.mozfiles.com/files/1225924/apollo_munich_optima_restore_brochure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403417/normal_5ff8ffbe4850d.pdfIn PDF document text
    • https://site-1235873.mozfiles.com/files/1235873/sewuzav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459324/normal_5fe357b5e3e66.pdfIn PDF document text
    • https://site-1179585.mozfiles.com/files/1179585/world_war_2_military_aircraft_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/jfgfh6q/free_printable_preschool_learning_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448126/normal_5ffa94b4229dd.pdfIn PDF document text
    • https://site-1195473.mozfiles.com/files/1195473/juicy_fruit_snacks.pdfIn PDF document text
    • https://site-1209810.mozfiles.com/files/1209810/english_reading_worksheet_for_grade_4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuzariwa.rf.gd/writing_process_worksheet_grade_5.pdfIn PDF document text
    • http://nowivopikuzud.epizy.com/nodajupapiniku.pdfIn PDF document text
    • http://sodarag.epizy.com/calculation_of_bonus_in_excel_sheet.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_off0000caf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF8 5228 bytes
SHA-256: f1dbcdaaa93a14f016f10a055b3e274c2300d8de896fea2b377348fa2dfba3ce
font_01_sfnt_off0000dcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBF 9892 bytes
SHA-256: 30a5246cc049764479a8096e3e49bda22327f735c6142baab32eba8509ac7b17

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