Malicious PDF — malware analysis report

Static analysis result for SHA-256 80df0b7d94646bc9…

MALICIOUS

PDF

71.3 KB Created: 2021-09-19 11:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a64e565ae387a0baddb15de1abd59882 SHA-1: 6b4a4829c9c86fa314597f3984113ac0aa9742b3 SHA-256: 80df0b7d94646bc99b93a8b5ae1dba60d0d033c207538bd0d10fc85e16203415
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs, including one pointing to a raw IP address, suggest an attempt to redirect users to potentially harmful sites. The PDF structure and numerous external URIs strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cructi.ru/uplcv?utm_term=tamil+ringtones+2021
    • https://printjet.pl/pliki_user/File/60626758534.pdf
    • http://upnbkk.com/file_media/file_image/file/jobuzibe.pdf
    • http://ducnhua.com/upload/files/soluni.pdf
    • http://aqs-group.it/userfiles/files/48113678696.pdf
    • http://mkpstroitel.ru/upload/files/nokaxaw.pdf
    • http://eventclub.pl/userfiles/file/wopurut.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2ed523316899604cb9fdf77ff42c62ab/71416803503.pdf
    • http://cnmrobotics.com/files/files/26636794886.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb9e69125e---jopudufixurub.pdf
    • http://katyababash.com/images/uploads/file/vufevam.pdf
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/277232230.pdf
    • https://yomadesign.com/userfiles/Proj_Name/files/91847315880.pdf
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/36922742574.pdf
    • https://www.netcorp.hu/data/editorfile/28232470462.pdf
    • http://dianacb.cz/userfiles/file/zapatenemuporofalopesim.pdf
    • http://www.galiantsolutions.com/emailimages/file/wovazugepufikarexonu.pdf
    • http://www.dereformasenalicante.com/archivos/files/69282541178.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/431152d40914b423fe9dbbc40811bee2/53193816977.pdf
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/xamewefigubofegopozovosat.pdf
    • https://sowlindia.com/userfiles/file/89431210726.pdf
    • http://kimsanghun.com/upload/userfiles/file/2021971829486189.pdf
    • http://dydlhx.com/upfiles/file///xuveresanakuwebaloje.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://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_off0000b606.bin
7589382f4e8f73daf340cf5e8566ec7dc31e04ceb348f2a5addf0987c96715a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB606 16280 bytes
font_01_sfnt_off0000df7a.bin
0ee88cfa854affa174ab527638bc9359e86e573932c6317804f716a370b52199		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 10708 bytes
font_02_sfnt_off0000f81d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 16792 bytes

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