Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfea2dab2f9ed681…

MALICIOUS

PDF

76.6 KB Created: 2021-03-21 23:55:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29990cd5558f569aac0ac6bfaddfcd57 SHA-1: 90f3e9acd0c42c326dde28d61e9962f7ff8a8fa9 SHA-256: cfea2dab2f9ed6819a8795b23b054fb05d5d54cb910cd20759f666ab2cac5487
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The primary external URL observed is vilenefex.ru, which is likely used to host malicious content or redirect users to phishing pages. No scripts were extracted, but the PDF structure and numerous external links point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=cuisinart+chef%2527s+convection+toaster+oven+manual
    • https://static.s123-cdn-static.com/uploads/4371013/normal_5fc99af4de6e6.pdf
    • https://cdn-cms.f-static.net/uploads/4529780/normal_602605468f082.pdf
    • https://falumegobe.weebly.com/uploads/1/3/4/7/134702986/jetad-lideg.pdf
    • https://lenololiwi.weebly.com/uploads/1/3/4/4/134455370/nitivet_sonarudalutima_bevok.pdf
    • https://cdn-cms.f-static.net/uploads/4474746/normal_5fd89abb972d9.pdf
    • https://cdn-cms.f-static.net/uploads/4449001/normal_600dbce2eda57.pdf
    • https://static.s123-cdn-static.com/uploads/4377662/normal_5ff9a7edbff8e.pdf
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/1ccf4b0437387.pdf
    • https://cdn-cms.f-static.net/uploads/4468531/normal_6021900f6f683.pdf
    • https://static.s123-cdn-static.com/uploads/4387243/normal_5ffc554bc4491.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5e4af96e-dc05-43ea-9386-10d2bfac1c5c/99833987094.pdf
    • https://uploads.strikinglycdn.com/files/3ad3f31c-906c-457f-8aa2-584c36442bcd/how_to_draw_a_christmas_tree_star.pdf
    • https://uploads.strikinglycdn.com/files/d2c4392b-63dd-4fe8-9e00-cc7973160e04/moneyball_book_vs_movie.pdf
    • https://uploads.strikinglycdn.com/files/2286d8df-5d8a-4aa0-a4bf-59dc3b32bc2d/what_is_9001_iso.pdf
    • https://uploads.strikinglycdn.com/files/8ea1b82c-9043-4979-bf85-acf1bc86cc3b/how_to_turn_on_backlight_on_spectrum_remote.pdf
    • https://uploads.strikinglycdn.com/files/e5d1546b-57c8-448e-9971-eba660b0819c/luvipemewimomow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e992.bin
5dcd332be070774df7d7231fad85df5c0c72eff552ef3f6e943c0c15e38a32b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 5120 bytes
font_01_sfnt_off0000fadb.bin
4fbd86b2149f86df56c4ad187a9476de58c49a929ac689a7f158d362e181eed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 12264 bytes

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