Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3f1be52421be58…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 20:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 03c8d0ecc62002f96e7c456fe4dd88c1 SHA-1: f576d1d68fa85a79320f8ea56f26abbe7e38ddde SHA-256: 4e3f1be52421be58f3b3ce13437ed1c801ee340bf9969d95c2446306cb5d73ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the execution of malicious actions via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ketchas.ru/uplcv?utm_term=crown+land+use+map PDF link annotation
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/21336909524.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/runifexagoluzipotekod.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/sugolesabukomofakejetalaf.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/17952416362.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbf795b460---nijerajudutanibexovu.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/24640280232.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/gekufetamemut.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/migubu.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/dulaboxedo.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/126131671461310dc824022.pdfIn PDF document text
    • http://philboyd.com/9715066332.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/lovom.pdfIn PDF document text
    • https://amgaa.org/temp/files/86504968565.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/vetunekadow.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/dotixoxetib.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210905_230006.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/32436838834.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/jawapakesexalikatono.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141d5b38a57d---83411809557.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/josupenefiguzifasev.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/23897139126.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/ruxexuwiwupezebefula.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/rasamopodizevebinuvovas.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/75768975478.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/gonarixisiki.pdfIn PDF document text
    • https://protrialse.eu/files/files/97232634902.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/futopebugaf.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_off0000d440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD440 17088 bytes
SHA-256: c66d404c7c8fa80b4872b6d16c2e93b35dfc07806ba41ee3651cb2bb55a49492
font_01_sfnt_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CA 10580 bytes
SHA-256: 744bbd40842c3109f4aa9040edcc3f5b863082270019931beca26ab1bd620acd