Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c13d242cdac61d…

MALICIOUS

PDF

92.6 KB Created: 2021-09-09 11:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cf076775baaab81f392063fbfcb9710f SHA-1: e071edaf8b169007ae1f27b4eb2e55d6c7456222 SHA-256: c9c13d242cdac61db018f82a6fea8b6ab54faf30945fbb6da9a4acd28554d34f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable domains and employing UTM parameters, strongly suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=go+movies+malayalam+movies PDF link annotation
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130ea1cd0faa---napejo.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/28496811758.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e5e9be1d57b8857d0fbb856287b72730/sofadubamaviriguw.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/31706375591.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210907_173132.pdfIn PDF document text
    • https://kar360.com/resimler/files/24836902774.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/nerokuzesamidunopaduriro.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/88163130484.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/walokugurumuliderowitopix.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/susimumopevolukikerudiwub.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/2109061111372141271m7d2s.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/38044419438.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/wagiwixefiwofanesivobaru.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/punozulonugelamodumafor.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/venuzekasomezelolepegi.pdfIn PDF document text
    • http://mlight.cz/archiv/file/makasoj.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/58648415464.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/milexemulotak.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/39537378598.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/77027356477.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/77865717463.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/52818390185.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/62069914521.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/48304930127.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D4 10188 bytes
SHA-256: 31f1f304d26e241187cce5569bd7a7fb8324b6e8d788bda3775b6bccd93fb6be
font_02_sfnt_off000137b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B3 17264 bytes
SHA-256: ec1148063f362effbde73b5d21ffc46316e411ca7535cdb5803e304532bf1ab3

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