Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b659adf62e3179…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 10:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 189698e89fa5eb06a378007976b99455 SHA-1: 717671d2330623b2c6de933ca27961c21aa43c94 SHA-256: 74b659adf62e31797362fd5f801e79963bed5e93e2d1c36363718ef238e7156b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with a high number of external URIs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination by using numerous distinct hosts. The primary function appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://vnsteeldetailing.com/UserFiles/files/65489083641.pdf In PDF document text
    • http://startmatbaa.com/userfiles/file/diwesurefogez.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/tozed.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/64467890175.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/52274809990.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/40947932839.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/pitigizakelute.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/27861737346.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202192232232264.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/pinigatolatu.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/jevoxenoxoxanigexiwezu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161306d95c7d5b---37798298848.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090109053273499.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/jegibomebeme.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/bf20b25fb0b04befef6062602ef674f2/judulawefibebejod.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/porage.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/gelusidaz.pdfIn PDF document text
    • http://infosierra.es/images/editor/65050561186.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/13108933658.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/fodifewidiv.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/99201157069.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/22976376092.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/47454041541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=forbidden+legend+questPDF 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_off0000cab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 10624 bytes
SHA-256: bd22fcd6d926f475da82cba1876741c29c7e90b6b1ca617f53dd45c55e6e4550
font_02_sfnt_off0000fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 16888 bytes
SHA-256: 7c13cb7f39f4261fa9dd68db414cd7b8e5db93648feebdc3cc7abfe906d4ac94

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