Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b2c6c29a36568c…

MALICIOUS

PDF

84.6 KB Created: 2021-05-15 23:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cced714f6f733dc3b8307af46d4e3cce SHA-1: 277b6cf62ac8f979d154f75ee1cfaab422ed291d SHA-256: 87b2c6c29a36568c63cfd21aa8a244fa1829246c640d2f082712fed5f701aada
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URLs, such as 'https://dugedepap.ru/strik?utm_term=weber+smokey+mountain+18+grill+grate' and 'http://souve.me/407642838019ppn6.pdf', are likely used to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a malicious intent.

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://dugedepap.ru/strik?utm_term=weber+smokey+mountain+18+grill+grate PDF link annotation
    • http://souve.me/407642838019ppn6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_606e3a2d4ba1f.pdfIn PDF document text
    • https://cdn.sqhk.co/mukujoripu/hfhfG1u/remove_unwanted_objects_from_photos_free_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/Oahazhg/forge_ahead_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411252/normal_5fd93fbd2a007.pdfIn PDF document text
    • http://changepass.online/zesesawuxilrdue.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/Xhj1jdJ/draw_line_in_word_mac.pdfIn PDF document text
    • http://redpandarecycling.com/roller_hockey_teams_near_medc8z9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_6050015c9b3f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/afe82a96-25c3-4dec-ad5c-10095be47935/tujokamadelizozebiwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccbb5fcf-f7a9-45c3-bfc0-af6e28e52766/how_much_does_1_litre_of_sunflower_oil_weigh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ec62310-43f2-404f-a588-da4860637b96/v_for_vendetta_full_movie_dual_audio_720p_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dd06828-8279-4f71-a1b8-f741b673c09d/sun_joe_spx3000_electric_pressure_washer_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1031c3d6-b9b9-45ea-92b4-361301027c57/how_to_install_first_alert_9120b.pdfIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_3fb22b1cddf7468b9e0a68352fea880b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfaf5802-016c-4cdd-9a6c-67fc21770e74/development_as_freedom_amartya_sen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a3fbac4-4657-4724-9296-4e6828140f8c/chick_fil_a_nutrition_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e9364a-e286-40a6-a2e5-cec896e15432/fenedixogeteruxaw.pdfIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_da0c74cc9e6842f2891b5007da65af27.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 5452 bytes
SHA-256: f942b34f5b11c99bd08c3f4be73eb4b935776c597d11813434359f4d13eeb343
font_01_sfnt_off00011174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11174 11076 bytes
SHA-256: 1071dcce2a38f2a513bcfe3ebf5d454727c01b946090546668ae397eb5fcb249
font_02_sfnt_off0001372c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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