Malicious PDF — malware analysis report

Static analysis result for SHA-256 a856fe0631b34497…

MALICIOUS

PDF

70.8 KB Created: 2021-09-08 16:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0aa94c9a6b18a44b4f2f0d1055d0d6d0 SHA-1: 2714c99bb739542df9a2ad94ad39b82c519d8796 SHA-256: a856fe0631b3449762c40461871740805082e4684ced8f9cef74edc1307fd571
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, with a high-confidence heuristic identifying a link to an algorithmically-generated URL on a potentially disposable domain. This suggests an attempt to redirect the user to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://marlin-aquarium.ru/ckfinder/userfiles/files/84237774370.pdf In PDF document text
    • https://eslms.com/userfiles/file/jizesojibesobofifopab.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/6108033a7b241902552bcf7f05b664ea/98192750909.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/19046481174.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/nuzazupulekedisazo.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/duwirupodeneti.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/99891916808.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/41123428844.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/dipofazimobiso.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/30369273900.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/nipasadozaziragoruxuxote.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/mawenigi.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210901_102801.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a6c8d52ccc396ce14d6ca409ec0e2b1d/selodidugokonakakoda.pdfIn PDF document text
    • http://amandamaitland.com/images/file/28185840460.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/8065067611.pdfIn PDF document text
    • http://szwygs.com/upload/10157363505.pdfIn PDF document text
    • http://devison-matras.com/upload/file/41561001123.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/51704088771.pdfIn PDF document text
    • http://epicridesnepal.com/files/bokobumofisa.pdfIn PDF document text
    • http://placc.info/up_image/31540549409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hoco+es20+manualPDF 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_off0000afec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEC 10436 bytes
SHA-256: 4c0285e59922c406a243f97e7b45bf64d52a9dbe3ad2dfd2b91f5e1593961f73
font_01_sfnt_off0000c79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 17644 bytes
SHA-256: 2ce8d7a597fabc2433fb29f7f36a295006ef5a6812ab68c4ffe5439e5d8e752e

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