Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d658d3de850003…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 23:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f6379ed9efb2b4189637542174323f5b SHA-1: 5783d691fe062116869371d775c0b0ed885e9b70 SHA-256: 86d658d3de85000347be6d7f632a263e8b44e2242adac119ee2f762abe48d959
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The presence of these URLs strongly suggests a phishing or redirection attack, likely intended to lure users to malicious content. No scripts were extracted, but the PDF structure and URL distribution are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=landau+mechanics+pdf PDF link annotation
    • http://toanlinh.vn/upload/files/xosonafafus.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/4595788366.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/rijepalowasexabekik.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/figufatosefawame.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210907163842.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/razugenogep.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132142ac9ac8---51487954501.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/89119262054.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/safogeronojiwumujukuxir.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/80514014456.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/wibajizixexonogevadesito.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/guvijesu.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/48372231207.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/lejakevigemolepa.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/xexelatolo.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/xejoduxurop.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/962a112051b1d78af7654ba1e1a79e03/muwanikafuru.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/35940656341.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/68666483185.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/38476826696.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/12947828335.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_off0000b351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB63 16448 bytes
SHA-256: 33ab63becd1d4fe75b7a2303d4ad988cc78cdaf5e135ee5251f65030cf7f7031
font_02_sfnt_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 10576 bytes
SHA-256: b11e9989ca4a6111af2ccfc4da0094bcbe95ff3eded7ebc52feec6af9f6ad89d

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