Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba13e1c5cce238c…

MALICIOUS

PDF

80.0 KB Created: 2021-03-15 17:38:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9508fd98b2bc37b247785106ae3f0d5 SHA-1: db5d43fa5c05e989c8b1d8bb165a6002f1dc4490 SHA-256: 8ba13e1c5cce238c46f548d342f1d65ba0c43bacae85b9b0f272142db9ce3ffa
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated or use SEO-like keywords, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=summoners+war+dragon+b10+speed+team+twins
    • http://obsluzhivanie-kompyuterov.moscow/sojijumubx8o4.pdf
    • https://cdn.sqhk.co/miwiwefe/Qgigcji/online_gantt_chart_template_free.pdf
    • https://lonofajizol.weebly.com/uploads/1/3/5/3/135389348/wixakiragi-mepanafi.pdf
    • https://cdn.sqhk.co/kawiwitifa/ibwhage/14421646334.pdf
    • http://batmbatm.ru/monopoly_cheaters_game_guideyds55.pdf
    • http://ruszaimclub.ru/jimpix_sheet_musicfvofx.pdf
    • https://cdn.sqhk.co/joxusozomilo/0bhiejj/54476824646.pdf
    • https://cdn.sqhk.co/muzorefu/ejhjedh/73986821021.pdf
    • https://tofesozexeraj.weebly.com/uploads/1/3/4/6/134610570/bawakudobuvix-vezife-lijugitukuna.pdf
    • https://cdn.sqhk.co/duromivap/gdihal1/destiny_2_forsaken_missions_guide.pdf
    • https://cdn.sqhk.co/xelimibela/gighh3A/alien_shooter_2_vengeance_cheats.pdf
    • https://cdn.sqhk.co/xavaxonad/QKFihhj/wix_customer_service_representative_salary.pdf
    • https://cdn.sqhk.co/rirelolut/a5Ugfjg/ninja_kitty_costume.pdf
    • https://cdn.sqhk.co/redixebu/ojfsgc4/21008876682.pdf
    • https://cdn.sqhk.co/jawefujivi/gcsjhcs/hideaway_hills_carryout.pdf
    • https://cdn.sqhk.co/muzexeragod/gjbWLYa/ansys_maxwell_software.pdf
    • https://cdn.sqhk.co/tabuguran/ajcmghL/74088872802.pdf
    • https://cdn.sqhk.co/febenanedibu/AVgchaZ/best_cooking_games_for_adults.pdf
    • https://cdn.sqhk.co/toliximozupa/ghggmgc/easy_white_cake_recipe_without_buttermilk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_24a938d04e054641a2aca9a46e450a71.pdf?index=true
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_1e88dcc86fd94d53b1dbcd3c7af7789f.pdf?index=true
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_8b88f223bb2c4b79810534cf1a19b0c8.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e37c.bin
3444bdf56b24ba028b9bde0b2837b55eac7371c69463c189e8e5f54e186768b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 5776 bytes
font_01_sfnt_off0000f717.bin
cfa557ef3ffbe35071005f3fc3271b549d6a6ad804f94516f5f35df099c90567		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 10792 bytes
font_02_sfnt_off00011c55.bin
4f9bddd8120402856594b33adaeac6aa436e26f5eb63b748bf1666df64cd7ce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 16340 bytes

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