Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24c5f7c92be4ae0…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 20:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7bc452cec6ccb7bac2e9a2bbb96a004 SHA-1: 13fb7e7ee5efad503f807385dd09e0f4f7ef58cd SHA-256: c24c5f7c92be4ae035905f439f6d7f70af451a695ff222d51cc07558d9991ad1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://archism.ru/uplcv?utm_term=tatzelwurm+god+of+war PDF link annotation
    • http://zamdq.com/filespath/files/20210906231216.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f55dc77c13---87503493521.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/xapopelagasutu.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/43693523020.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/pafasakibet.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/4052455300.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/96792517856.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/jemebagoxiwulu.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/7188510311.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/subegevetu.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/38293134539.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/manitijipiwewuzepen.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/30359431751.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/taxalefonisifalipe.pdfIn PDF document text
    • https://pepsima.biz/files/file/684554735.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/13667780699.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/vomubujemavuwezitugovis.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/14226401420.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/zuvodarixotuzawudekuf.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/ruwubuzapedite.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_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 10544 bytes
SHA-256: 4d6e52c89bd6c4a3e6bdb809884230c9e0c6f8eb3225e1b4856efce1ee05cbf4
font_01_sfnt_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 17708 bytes
SHA-256: ec2bb029cbd399681eb8a46c30baac31851551f4643f95d9849c906732a62d41
font_02_sfnt_off00012354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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