Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb96398e6a885fcd…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 05:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a56297a8baa4295f56d494c9d93e1473 SHA-1: d9c3579566e4977ff586b0665c1efd55ed3825cc SHA-256: bb96398e6a885fcdf71d6acd0c467303901a3286ee7cc47cb8af07aca9cfeafa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using small PDFs as link farms on disposable hosting, and the presence of embedded URIs further supports this. While no scripts were explicitly extracted, the nature of the URLs and the detection suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=the+ultimate+art+of+war+pdf PDF link annotation
    • https://kingwaterpure.com/ckfinder/userfiles/files/56892378416.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/pasokilab.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/99161529092.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/birasilumamuvomuvijuxina.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/geforidele.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/11872328733.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/xivanoviketoj.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d65086b098---80512198357.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/52403114432.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/38015403760.pdfIn PDF document text
    • http://metabolit.ru/files/file/85607137129.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/68540820480.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/wibutinuvika.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d06a7cd96---76991306838.pdfIn PDF document text
    • http://storemisr.com/uploads/files/pojovazelugaverutazak.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/vasobenoxadiresopaw.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/rotalaxatikudalapavif.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/83714558220.pdfIn PDF document text
    • https://aspirans.com/files/file/50729331490.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/vilibepijividuvuvolami.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/75322863245.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/44559204827.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/87733870091.pdfIn PDF document text
    • https://umutfm.com/resimler/files/29058167838.pdfIn PDF document text
    • 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_off0000dace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 18396 bytes
SHA-256: 3d87475dfb25d7e856f0ba69cbb07e2bba6f9da958b4905b49f08bb85d58a3b4
font_01_sfnt_off00010b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12340 10640 bytes
SHA-256: 6fe451f06d2bd993afedb9cc8d6e8800197001c3ab8b0b3e2baf05d754e6de78

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