Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d5c405cfa3bb50…

MALICIOUS

PDF

80.1 KB Created: 2021-09-22 18:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 68a9666638adde157fe47194d4ec78e7 SHA-1: 7bdb0c7c9658cc6346afc9113db57b755fa52faf SHA-256: f0d5c405cfa3bb5067c6555de044cea86d94bd30ac4f9ce66e5d9d16355d215f
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 that point to a link farm hosted on disposable domains, a common tactic for distributing phishing pages or second-stage malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to redirect users through multiple sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=best+site+to+download+old+bollywood+movies PDF link annotation
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/8737006212.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/27116246710.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/vafasegutojuwevizot.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109150532191561.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/2661513383.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/ladufewegijinexanavezaro.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71193787614.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210919235231.pdfIn PDF document text
    • http://khamranghaiphong.com/upload/files/lomosixakup.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8471074e---lulugozemobetan.pdfIn PDF document text
    • https://preciseenergygroup.com/media/bokez.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/jasosaseboxibupazizu.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/zokasobubezab.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/20411212076139ccc7b98d3.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/pexazedusopuzafiv.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/musebaxorumobojapo.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/lozepeluxu.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/gevuzujufigevobofigi.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/33788f2b0fa789bb65eec13776e9e3a0/58503438286.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/20129343669.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/lobudufakuzako.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/35609467853.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_off0000d48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 10768 bytes
SHA-256: 108d2c3d695029986b87fb4a21a828e8b25938da2236870650a4d05e2ebb4f45
font_02_sfnt_off00010586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 17348 bytes
SHA-256: 598cc88af7acf48101154ca85423838871c2455ec8296fa028be87072e3edcec