Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f6dee06a32386b…

MALICIOUS

PDF

73.8 KB Created: 2021-03-12 03:54:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c9f48c99989118292131f30070bdd1a SHA-1: 566df4946049f3828e2bef890f799ffd9aa61025 SHA-256: 85f6dee06a32386bba7df0fe6751a6d9340b753057edf1db8be70e54dcefb5f4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files hosted on various platforms, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to potentially malicious content.

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://leonvi.ru/award?keyword=1004p+appraisal+form+pdf
    • https://sesuzefodapu.weebly.com/uploads/1/3/2/8/132815176/5713077.pdf
    • https://cdn.sqhk.co/nodewanase/XDdJx0m/download_wallpaper_sword_art_online_asuna.pdf
    • https://tarutugiwom.weebly.com/uploads/1/3/5/3/135326066/d46e6bd5fe9.pdf
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/2a52a2.pdf
    • https://cdn.sqhk.co/nanagajog/gevxhhg/blockly_maze_level_9.pdf
    • https://gikovasedubum.weebly.com/uploads/1/3/4/5/134507074/32c77648876f7b.pdf
    • https://xarugowa.weebly.com/uploads/1/3/4/7/134733051/datadufiwi.pdf
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/7614887.pdf
    • http://davebamonuzove.medianewsonline.com/5903780567.pdf
    • https://cdn.sqhk.co/bapuwanuvadi/GGhghja/among_us_free_game_on_google.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/baxegezivumi/36285654009.pdf
    • https://s3.amazonaws.com/gupojakami/crafting_dead_map.pdf
    • http://tizexazebubo.atwebpages.com/my_sony_dvd_player_is_not_reading_the_disc.pdf
    • https://uploads.strikinglycdn.com/files/3aff603f-2a57-419e-9ef4-b27b4881a8e5/how_much_power_does_the_hx_stomp_need.pdf
    • https://uploads.strikinglycdn.com/files/bac90119-2dd2-4c58-8746-5e3a7caeec5c/starbucks_oat_beverage_nutrition.pdf
    • http://wutorokanotomav.onlinewebshop.net/lobuporeforeki.pdf
    • https://s3.amazonaws.com/lewuli/dixat.pdf
    • https://s3.amazonaws.com/najubu/jabawovuvilo.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_off0000e66e.bin
5947ff70d64489489c0df7ed897b6b5f9333fccf44393e1e4601573a2648b84a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 5376 bytes
font_01_sfnt_off0000f8a2.bin
c28bb7d2280a001e9f57e391e0f76c39f66380b45d4a9bcdd514906eadd9928f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 9936 bytes

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