Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7918a3a579954df…

MALICIOUS

PDF

75.5 KB Created: 2021-05-07 09:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e0a70b6a29361368c2dfa53337090a82 SHA-1: 1060cff70a8228f6ac52a684255125003d951952 SHA-256: c7918a3a579954df933ae60fded049d7122647eb024c9536e7481913719fff52
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=amc+10+2018b+pdf PDF link annotation
    • https://cdn.sqhk.co/jimikafede/dibidhf/62638780817.pdfIn PDF document text
    • https://mobisikude.weebly.com/uploads/1/3/1/6/131606420/mizuzidufagex.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/cjdfmha/malavifurewinawutakedana.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/WqhgdcM/wolf_simulator_games_for_pc.pdfIn PDF document text
    • https://nogiwesetegi.weebly.com/uploads/1/3/1/6/131637024/9680744.pdfIn PDF document text
    • https://bemagage.weebly.com/uploads/1/3/4/5/134525224/d7dcbd37d943.pdfIn PDF document text
    • http://xevijuwidenuxet.mypressonline.com/best_java_programming_books.pdfIn PDF document text
    • https://newakikijako.weebly.com/uploads/1/3/4/3/134351088/3488268.pdfIn PDF document text
    • https://zovarufegurer.weebly.com/uploads/1/3/4/6/134625168/kupol_beradeto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450730/normal_60349de550392.pdfIn PDF document text
    • https://cdn.sqhk.co/ropulufira/Iiajfha/jnc_8_guidelines_for_hypertension_diagnosis.pdfIn PDF document text
    • http://nomevufaneboja.mypressonline.com/accrual_and_deferral_configuration_in_sap.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/jiLhbvQ/ticket_to_ride_new_york_board_game_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461484/normal_601be434c390a.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/7SlABMj/babuzos.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/7e2cc64d-328a-47d3-bcea-3ea91f5da0a5/45157518562.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/mathematics_teacher_s_guide_grade_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5cb2502-cee0-45cc-832a-e7ab7b47df87/how_many_calories_in_a_cup_of_vanilla_soft_serve_ice_cream.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_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 5436 bytes
SHA-256: 32bd66de8c081676be1c1231e7f268e541a690934c4b3cbde1534e997e9ffbaf
font_01_sfnt_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 18308 bytes
SHA-256: 815bf21ab0a667ce13cb375acaccc8e4b91087ba96c9cad5cec6cc93bd64df62

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