Malicious PDF — malware analysis report

Static analysis result for SHA-256 098aaffc8fcd6f2e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 13:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bf5c2fc51f63bae529bb47e07421e76f SHA-1: 511f42ef07490184b42ba3cce0c1b0ac7e9f7015 SHA-256: 098aaffc8fcd6f2e271084057edeb2e48dbec4931fb8519ceb26ed322b799c2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains. The presence of external URIs and the link farm nature suggest an attempt to manipulate search engine results or distribute further malicious content, potentially through a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://mediaworld.pro/ckfinder/userfiles/files/totojimaxelefowumever.pdf In PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/fawazujiwujit.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/90066221539.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/sopixukiti.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/20827032630.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/rixumimelutodumovezuduru.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/40057584336.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/81828457897.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/39134004374.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/56456311191.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a16e492d8d---paxakoraverojilagonelap.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/viboxomasolagik.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090514215117.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/jizumokoba.pdfIn PDF document text
    • https://actor-conseil.com/files/file/jevelokolisezepujoxif.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/3015663976.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/87598403577.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/9smjgo6npc9uo5behi8sbpjjv6/vaxuvalotiwikona.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/24657523326.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/24915476191.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/22852312715.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/gosalulo.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/gurevagoribe.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/ramonevofufewazetowis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=good+apps+for+reading+mangaPDF 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_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 17212 bytes
SHA-256: b913081a68c2c35b57ca3aa61000c169441d94a519c289844207941063891442
font_01_sfnt_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F8 10736 bytes
SHA-256: 8292d690b3fcb895d60c20260ca71b1f5fc0875f4bf668baa977afe7dc2e6b52