Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8c095aecda7c8c…

MALICIOUS

PDF

93.5 KB Created: 2021-03-16 17:17:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bc470bc520a95038e98b97a7b46f7c7 SHA-1: 369ad06a80221323b1622fb4259ae8ddb606be7e SHA-256: 5f8c095aecda7c8c1db1311222b2da7768292c48002199fda98c08343533a8b0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are SEO-farmed, suggesting an attempt to drive traffic to potentially malicious sites. The primary malicious URL identified is https://lozipotod.ru/wix?keyword=kaji+evangelion+height. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/wix?keyword=kaji+evangelion+height
    • https://cdn.sqhk.co/pefisemise/hh43jbH/robotics_notes_double_pack_nintendo_switch_game.pdf
    • https://cdn.sqhk.co/jebuxanit/ggdheic/zumonudifowaximerobib.pdf
    • https://nakaleraba.weebly.com/uploads/1/3/4/6/134606700/nesinuwujokafatugu.pdf
    • https://cdn.sqhk.co/lazujanaziri/hhiPAih/cooking_dash_cheats_2018.pdf
    • https://cdn.sqhk.co/nanagajog/HFckijj/space_agency_2138_wiki.pdf
    • https://gugivubur.weebly.com/uploads/1/3/4/3/134390132/8777803.pdf
    • https://static.s123-cdn-static.com/uploads/4405409/normal_6002a2d33619d.pdf
    • https://static.s123-cdn-static.com/uploads/4473890/normal_5fcbddcfe1fbd.pdf
    • http://nepoxiduvilej.scienceontheweb.net/mafijevorutoxut.pdf
    • https://cdn.sqhk.co/genizataxom/scjcij5/facebook_video_er_apk_pc.pdf
    • https://zoxexalibefan.weebly.com/uploads/1/3/0/9/130969973/2e56e9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f59c8fb6-93b8-4e52-8b0e-37d008caa760/how_to_play_guess_the_baby_food_baby_shower_game.pdf
    • https://uploads.strikinglycdn.com/files/3ad8f960-3b69-433a-a526-e3a593653f99/how_to_establish_residual_income.pdf
    • https://uploads.strikinglycdn.com/files/628dc703-1e49-47ed-913e-673c5511ae27/lofotobonowetetixajoti.pdf
    • https://uploads.strikinglycdn.com/files/ca55a71d-c8a5-4377-b2c1-92d8dc9642f4/94021154078.pdf
    • http://petojijoxura.onlinewebshop.net/relilifixotufutuzux.pdf
    • https://uploads.strikinglycdn.com/files/cb8e804e-9377-4fb5-b022-2b18a6e00f8b/66699708941.pdf
    • https://uploads.strikinglycdn.com/files/ef3cca95-e10e-4138-9325-493ed50ca017/father_and_sons_volvo_springfield.pdf
    • https://uploads.strikinglycdn.com/files/eb379cf0-fdd4-4c83-b4dc-ec1782627a13/que_es_talleres_educativos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe31.bin
478fc8b41b3ac8e6cb0c6f6bcd23a3f1da3512d01f173eac1eb113ebc8bd9ae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 15600 bytes
font_01_sfnt_off000130f2.bin
48d271fa90a15cd8b127382c28cbb2a2a39c479b04212f5544e085781f97db6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130F2 4780 bytes
font_02_sfnt_off00014149.bin
2ce8d153e4033b1d683006468729bc95faccfb2cbc18cd1d4eccee3c85e8aa9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14149 11544 bytes

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