Malicious PDF — malware analysis report

Static analysis result for SHA-256 4934ab312630dcf0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 15:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6fd47b98afa28b33fb582c1962eaee8 SHA-1: 5c723650b34575198d0747ff4778200e108d67a5 SHA-256: 4934ab312630dcf046bdea7fbe2cd9a601f8481843294f1be22d6c3819b5e6fe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 point to disposable domains and appear to be part of a link farm designed to obscure the ultimate download destination. The presence of a 'download' lure further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hurtglass.pl/upload/file/gidege.pdf In PDF document text
    • http://topbuild.net/content/xuploadimages/file/14790161215.pdfIn PDF document text
    • http://kelsenator.com/userimages/tokepimavagunumasevufe.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/tinuworidaxowuwepe.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/morusez.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/tufizaremigutipazire.pdfIn PDF document text
    • http://test-immo.com/file/genizakelekubadiwosilop.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/tipozikosarelekakaxufe.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/19946462465.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/julabogujilo.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109131906118239.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/bavolarovisip.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/44087511894.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/zuzerifemovovakari.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/98576959277.pdfIn PDF document text
    • http://tid.vn/upload/files/22664627356.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131098b6041b---27878522938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+win+10+pro+32bitPDF 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_off0000ce1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1D 15640 bytes
SHA-256: 0a2069dd254e992ebd9f3f489781d0ffcd8b662c2f6ea3142991f52a7c680fa5
font_01_sfnt_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 17612 bytes
SHA-256: e9c1f8135b7acd0b050645fd6e9bd187170d607275330e4fa1793816dc425858
font_02_sfnt_off000123cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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