Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a3618cec787a0a…

MALICIOUS

PDF

74.7 KB Created: 2021-09-08 18:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62c293a614b111af825c03898ac374ba SHA-1: 2090086228fbd272d11500d8fce6195f7428f762 SHA-256: 42a3618cec787a0aa69b2ae8e4f74a552f64f23ed3c880ab34e1da0f4db96ab6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is a link farm on disposable hosting, and it contains numerous embedded URLs pointing to unknown or potentially malicious domains. No scripts were extracted, but the structure suggests it's designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://essaidafm.com/uploads/FCK_files/file/71231817155.pdf
    • https://wilocom.ro/ckfinder/userfiles/files/riforipudoxupujo.pdf
    • https://otterdisplay.com/userfiles/file/65168565537.pdf
    • http://sibaco.ru/ckfinder/userfiles/files/28914505990.pdf
    • http://maremania.net/img_pagine/file/88727021552.pdf
    • http://hanhthien.net/uploads/file/wuxumivi.pdf
    • https://onderdurdu.com/upload/ckfinder/files/susigolazabekojobipaw.pdf
    • http://9262895.ru/ckfinder/userfiles/files/87423717256.pdf
    • http://sor1310.com/userfiles/file/sarerafafigoxegekevo.pdf
    • http://toyotarent.tw/FileData/ckfinder/files/20210902_9748547FC8D8D74B.pdf
    • http://eegbiofeedback-leszno.pl/userfiles/file/mibewivinobibatibub.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/17977669388.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/ditibutibilixir.pdf
    • http://huh.hu/UserFiles/File/potisolojiduvejij.pdf
    • http://kengosushionlineorder.com/uploads/files/koxebevavazoliluse.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3f3abd5b---vegobixezifegotebilemiloz.pdf
    • https://anandalaya.in/resources/file/51981935032.pdf
    • http://perlawarmii.pl/userfiles/file/zakozobebiwaxudibalojez.pdf
    • http://fantasymusic.it/userfiles/files/xupobefajokazajon.pdf
    • https://waelfawzy.com/userfiles/file/
    • https://www.oalysa.cz/ckfinder/userfiles/files/59291748590.pdf
    • http://runo34.ru/attachments/file/nejolevapojedujesifalonov.pdf
    • https://patriciogaete.com/upload/file/batunamitifukub.pdf
    • http://stefanourso.com/public/userfiles/file/dapifonorusot.pdf
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/7427803035.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f57291cdd1---90443772060.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mcdougal+littell+pre-algebra+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c134.bin
67fbe49bedbf89d7c1912bd217598b794012df319e6507d76c9422b5b689915a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC134 16556 bytes
font_01_sfnt_off0000ec2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 16792 bytes
font_02_sfnt_off00010441.bin
afc33a5b31f0744ef0baa2d5e7c2dae6fa1d7d1b169a209752aebbbf6290bb8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 10792 bytes

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