Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c26ed9f34298568…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 11:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5885b8f013f4936d22445e00a83ac788 SHA-1: d52e104104c43cb944686d3076cfc6a7b6a704bf SHA-256: 4c26ed9f342985681424f199ffab1830f4a3dee2f8fe83367babaf9afbbf93df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM suggests an attempt to disguise the malicious nature through a large number of distinct, low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://texinpack.com/uploadfile/file///2021090410344167.pdf
    • https://codecs.ro/images/file/84605630382.pdf
    • https://djecijagarderoba.me/userfiles/file/xewupuz.pdf
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/tupixedusufumobesisaw.pdf
    • http://king-pro.com/userfiles/files/gekafudatofovole.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613be9de51307---mutojomepuxanisipe.pdf
    • http://inistor.com/ufiles/files/nimimu.pdf
    • http://amghanoi.com/images/ckeditor/files/51234051445.pdf
    • http://canhtoanland.com/upload/files/midujeg.pdf
    • http://rbc-bezorgdiensten.nl/upload/81882522500.pdf
    • https://esperanzadeavila.com/fotos/file/63914316922.pdf
    • http://studiomarcheluzzo.it/userfiles/files/taregofa.pdf
    • https://smilaxlabs.com/userfiles/files/30959489721.pdf
    • http://rentbucharest.net/images/userfiles/70673622008.pdf
    • http://jsqnchem.com/upload/files/telupoxokizorowagazuxawel.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161403e3317972---torak.pdf
    • https://ka-base.no/images_students/files/75753347204.pdf
    • https://ipkameros.lt/userfiles/file/vifewegivabo.pdf
    • http://autoscuolecasetta.it/userfiles/files/49920318299.pdf
    • http://abbwingslynnhaven.com/uploads/files/joboramera.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+book+of+breathings+thoth+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_off0000d0cc.bin
577f97d196aa7a9eaa5f34e3956a5191c372d605fc779c61a3671d6aa4469619		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CC 10928 bytes
font_01_sfnt_off0000e9ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 16792 bytes
font_02_sfnt_off000101be.bin
e833c4ce266a50bdbad2c0ef8f7542fbfbc16af9ba9c572808a5a815840c281a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 17432 bytes

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