Malicious PDF — malware analysis report

Static analysis result for SHA-256 787c57b3d1c162d3…

MALICIOUS

PDF

70.6 KB Created: 2021-09-13 19:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e116f1edfdc23bcbb83a056e74b2173e SHA-1: 3c515c1b247c8e8d73b6ae4fa2117d3204b49449 SHA-256: 787c57b3d1c162d3be5652256562eba8a93a125d818cf956a6211738e064800a
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://nanobubblevietnam.com/uploads/userfiles/file/kukubagevigez.pdf In PDF document text
    • https://medius.sk/userfiles/file/bipokurosi.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210909_20D6682F36E9DEFC.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/xupaxi.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/dipojelefusepezegi.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/lomezemelebilefuwaja.pdfIn PDF document text
    • http://df-2.de/images/daten/file/10706417818.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/73477195863.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/13202137992.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d008813827---13890349369.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/69123331827.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/nanetilufijokugepebek.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/pewum.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/zoxagegamedemajuna.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/12/51343592620.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/99327472886.pdfIn PDF document text
    • https://abss.pt/userfiles/file/busunepudox.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fdc500cb1---56954108551.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/34551093075.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210913_73D5446DC864A9BE.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/25332098779.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/32314546505.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/lumepewobogopigumovanuwaj.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/85197086834.pdfIn PDF document text
    • http://erictex.com/ufiles/files/10718218840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=asda+android+appPDF 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_off0000b616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB616 15796 bytes
SHA-256: f96a3738a93df6e6728792bdf0005b8ea0e06f184f205f846ba5b439cedb560e
font_01_sfnt_off0000de41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 10088 bytes
SHA-256: 141a6b6921cef6826335edd4e0f44dc7497a786df9a19ab52fba1f7ada54ad95

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