Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40d075f8f3d96b5…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 05:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ece8ae0e5a1dbcbd2d33a1bcb8fcecf SHA-1: 49a56be381a8247ba2c775c33bd11b593300b447 SHA-256: f40d075f8f3d96b51b01adac8a9e554b86315685a63b2c0dbb29fae30334660d
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. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the link farm heuristic indicate a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://cructi.ru/uplcv?utm_term=gta+v+online+latest+version PDF link annotation
    • http://www.tractortools.cz/ckfinder/userfiles/files/petixovurajovedokabikij.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/4312394396.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/80885886770.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16136af33f2006---48370693748.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/zipufesitozeloju.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/tozivetivubufe.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/47949256110.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210903_145240_167.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tegijosazakudokekuniduje.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/59528237777.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/renumile.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/50713435129.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/48409812246.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/91829223496.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/naturetoxojunulikozivona.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337b7c3077d---82335978290.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/28747324047.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/10394736047.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/wikejado.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/42446122963.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/dejuwonefif.pdfIn PDF document text
    • https://nyig.com/files/file/74925365063.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/wofupagukavemilose.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_off0000cec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC5 10204 bytes
SHA-256: 6b959d5a7b0901bdabdd619c1f311c930c43f62179a48f5a6cfb8c7ce636c12e
font_01_sfnt_off0000e5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 18664 bytes
SHA-256: d19561bb06a493f6cb1966c380239cc79c9491731a41cbf38d31ee9f8ee522f4

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