Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbff05323673d7c7…

MALICIOUS

PDF

82.9 KB Created: 2021-10-06 08:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 490cc95c3aa08108208faa73936d3e4b SHA-1: 291558936cdf5450e309ac745f6bcb976e14cf17 SHA-256: fbff05323673d7c70bc056725a94246ce1f58951318bb733659de330b1007f05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that likely serve as redirects to malicious sites, consistent with a phishing or malware distribution campaign. The PDF structure and embedded links suggest an attempt to lure users to external resources, potentially for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=tuckman+four+stages+of+group+development PDF link annotation
    • http://tomaszskiba.com/userfiles/file/75599842892.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/xapineselaxebarari.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/44891640953.pdfIn PDF document text
    • http://vejwun.cz/images/bonetikaga.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/41437678752.pdfIn PDF document text
    • http://sampleshipyard.com/userfiles/file/sobupovi.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109212204042962.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/gomewodijotok.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/11787231490.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/28484679622.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/fuziteturi.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/843c895617f24ecdd8338db06c3dcbd4/70256754207.pdfIn PDF document text
    • https://laps.pl/userfiles/file/satelizekejuvosaporipuvu.pdfIn PDF document text
    • https://thehouseproduction.net/file/zaguwovuzojigidananefo.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/8749432848.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/zowuzirutad.pdfIn PDF document text
    • https://greassi.com/editor_upload/file/zerekigu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141125e03719---tufid.pdfIn PDF document text
    • https://zzwgjx.com/d/files/35769961129.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/bebonozune.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210928182124.pdfIn PDF document text
    • http://torgoborud.org/images/file/dikirugupaxadavunejuxipop.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/dijixewixugeje.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/rumoxupoj.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/88093621329.pdfIn PDF document text
    • http://vuason.vn/upload/files/83100086293.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_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 11092 bytes
SHA-256: fc9c5b23bec7f0f8342e4a09216131ee030631ac5655287af4324d8c8d015fa2
font_01_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 18084 bytes
SHA-256: 2b2d82c7b800b4cd6e36236135e3c45e819efbbb1976d54c75bd3d028409ee78
font_02_sfnt_off0001258a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1