Malicious PDF — malware analysis report

Static analysis result for SHA-256 307a4362b2a6771f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 15:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7e68ed3f528dab0cdd27caa8228436c SHA-1: 4525fe344609122262be64b889c101c2d661f7e2 SHA-256: 307a4362b2a6771fef4e88d1f176500bda1f1337938e50a2345005ecd34d17a6
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, with a specific heuristic identifying it as a 'link farm on disposable hosting'. One of the URIs points directly to an IP address, suggesting an attempt to bypass domain reputation checks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/pinewevulofov.pdf
    • http://debrecen.varosom.hu/userfiles/files/mezojixariwidigo.pdf
    • http://zsdbiopharm.com/upload/files/sizoxavofuwulorovoxo.pdf
    • https://synersys.fr/contenu/file/nukerifikuberaravutej.pdf
    • http://museodegliarazzimarsala.com/userfiles/files/meriluxox.pdf
    • http://arcenevents.nl/site/upload/files/82777230913.pdf
    • http://dentherapia.hu/files/file/kudaxixevexoselimizis.pdf
    • http://bhk-aindling.com/userfiles/files/vilisunu.pdf
    • http://pension-erlkoenig.de/img/editor/file/11452739673.pdf
    • http://redactron.com/userfiles/file/25547915024.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141159816799---vuwimobok.pdf
    • http://membranekeyboard.pl/_data/file/lolezaxa.pdf
    • http://neonatal-surgery.ru/userfiles/files/vosixozejatiparomo.pdf
    • https://medicabg.com/uploads/wysiwyg/files/nurizalajuxaxinejun.pdf
    • http://newgatedesign.com/Images_upload/files/pofowojofenene.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613702724dbcd---40268237849.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/m4ggtc9cbte49jm4t8crco3f51/dozejomajajiputo.pdf
    • http://canxetaidientu.com/images/file/xagafubot.pdf
    • https://kurek-rowery.pl/user_pict/file/389986646.pdf
    • https://valstybestarnyba.com/upckfinder/files/sejilobop.pdf
    • http://kystar.net/filespath/files/20210901133838.pdf
    • https://gentrilieu.vn/userfiles/file/22759804804.pdf
    • https://newline-eg.com/userfiles/file/58842139468.pdf
    • http://pro-group.ru/userfiles/file/59641307465.pdf
    • http://ch-bovi.com/upload/files/mafopibomikaporuka.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ibis+paint+mod+apk
    • 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_off0000dcb0.bin
6282a4dc553ec20adb8fff71312af8eb13aadff782b76ad819b130937d96293b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 10460 bytes
font_01_sfnt_off0000f42f.bin
1636a3b56e6039e0b4ddf0e7ab22d1dcd804b7bd4c69ca39b0007ac6940678fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 18892 bytes
font_02_sfnt_off00012550.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12550 16792 bytes

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