Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb3634794f50b8a…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 12:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2553e3973dde1e6f502a76e40994d2e2 SHA-1: 827876967d192fbee06b076cb52e6ad19a4aa937 SHA-256: 4bb3634794f50b8a0462715e16a1f6dfa776de2b797a795f4a42ebe6d668d857
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. It contains numerous embedded URLs pointing to a link farm, indicating a likely attempt to direct users to malicious content or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://webinaris.org/ckfinder/userfiles/publics/files/69417913699.pdf In PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091315003373499.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/30553157794.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/39061083016.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/jowomalapon.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/47022456474.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/gojurujubegozi.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/76751139987.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/ruletagov.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/dulunakigudinibavure.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/43334547986.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/317107aa266de65deb932ab5818b629d/nokoratogowiserego.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/e7ilsbqtpvcbb2h1t9dp5o0qf6/59946586485.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/rerudapojidobiv.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/78616523477.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/lafajidixafasunebi.pdfIn PDF document text
    • https://brukspec.pl/upload/file/79197855181.pdfIn PDF document text
    • http://ermolino.mebel18.com/uploads/files/63587435238.pdfIn PDF document text
    • http://yongqingtech.com/d/files/5219646763.pdfIn PDF document text
    • https://fivetc.net/uploads/files/sobajuwubezeb.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/xatejoki.pdfIn PDF document text
    • http://surtek.biz/image/files/20150326_031826.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/63549194274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=coc+99999+gems+hackPDF 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_off0000adab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BD 15192 bytes
SHA-256: 41e182e1cbc748adb09db3edf09c652cf62b5eea77c47a9d37af2c0010a3cf2b
font_02_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 10528 bytes
SHA-256: a0fa2d9b5229cac18b65671d1e5d3548a98bbad68a60bd7aeaaa02740994f1a5

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