Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e87b91fbb3a78d…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 16:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b61b3ae869115cd58b58c068ff3ddf00 SHA-1: d555e8ed481faeea77d407d0b60e2ca9af58ac5c SHA-256: 94e87b91fbb3a78d577155497a66de33fe16a07fe6124392e1778bd025ff3ab4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, which is a common tactic for phishing or distributing further malware. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://trustarshida.co/cache/fck_files/file/vefolawugukakeperalof.pdf In PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/nakobuv.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/91474511024.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/nifonagituzevatilod.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/gudejepowe.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/dinotamutufafidapufefuwa.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/visozebijozuxule.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/supudotarasamowemaw.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/71435858906.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/sogukofodoboror.pdfIn PDF document text
    • http://showdoimovel.com/files/files/93988309403.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/veguvolifadowe.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/safere.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77377953875.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7995887032.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/8k3j126opk4pld194fmq4ao4un/29870340660.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130674656c4b---47809612661.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/genat.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/80532889335.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/sosagewudenanali.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/totajabexevoduwukali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=odia+movie+video+songPDF link annotation
    • 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_off0000d570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 18192 bytes
SHA-256: 59ca6899213cfa9e894931fd205c972adb7f7535139ac5bb84420ef87ba25618
font_01_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 10436 bytes
SHA-256: 3fd77f3863af9ec34e5a1a289416999ba268f33d227aadc20741e22559918027
font_02_sfnt_off00011c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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