Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f32bcb79defb378…

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 17:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 33a334ded81047f952b630b1d4537fd0 SHA-1: e63e88be96a2885d617765fb82c565a19ec8a114 SHA-256: 7f32bcb79defb3784ce20c36e56e7cc211216fccbb775f6144c1f411deb84ddd
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, although many are marked benign, suggest an attempt to direct users to potentially harmful sites. The presence of PDF-specific rules and the authoring application suggest a crafted PDF designed for malicious purposes, likely phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ressourcengarten.de/azubi/userfiles/files/xupowululelikik.pdf In PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/pogoxinaluroragosodakabu.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/gobubibopelelirivibade.pdfIn PDF document text
    • http://186086.com/upload/files/10402490115.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/tureloxo.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/48509071746.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/dusenafubetu.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/ropesalom.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/60478639636.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/95177639986.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/99287819829.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/37993693772.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/xejifiditalubonisuv.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/wikajipit.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/murivupexarukusosa.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/88220423873.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/xagimojeguwidilusalaz.pdfIn PDF document text
    • https://ubranni.com/uploader/files/58639982008.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/raxozovodurigazarizozej.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/96639320481.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/zigatadobozavumo.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/natizasak.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/jugope.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/mebujowotaxodivogazizekin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+vr+apkPDF 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_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 10080 bytes
SHA-256: 7911aff7cf49762c8aa7dc3b85dd445cc1e274966374e09f0b05b3366df18612
font_01_sfnt_off0001003b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001184d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184D 19084 bytes
SHA-256: 4cd4cb7f794ebd78b420f0d8ef2c8dc35daaf007cc3c72d6cec0939ae2bb163e

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