Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7609d811dd8d651…

MALICIOUS

PDF

86.1 KB Created: 2021-09-19 09:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de20608945dcad98ee93bb1d62db5ae9 SHA-1: 70bb5a9ec7a5c9e1442cbe5631dc1a0e55ea19c2 SHA-256: b7609d811dd8d651be82f4fe5989994038a7e8b5a8946020eb3acf4eef0f58e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic specifically identified it as a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the PDF and the presence of numerous external links suggest an intent to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://marketypik.pl/zdjecia/fck/file/namuxib.pdf In PDF document text
    • http://gojjang.com/uploads/files/fijiwonaterafi.pdfIn PDF document text
    • https://kultmotor.hu/images/files/60627450427.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/99439055140.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/653165634.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/bonusitafimifafodafelorip.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/xuzosuvuronopove.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/64241613668.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/kofus.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/wekiril.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/36792803318.pdfIn PDF document text
    • https://claudiodituri.it/uploads/xewututilikufi.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/xalaruru.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/tupemeroza.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/hjdpris98jt0sc1c5tc0ug7lin/62819875127.pdfIn PDF document text
    • http://fteq.ru/files/file/81600741392.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614671d241ae7---13244711842.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/91193422538.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/batozopafuxatigemani.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/50781380539.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/97703384960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=read+the+assassin%27s+blade+online+free+pdfPDF 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_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 18320 bytes
SHA-256: f2f129c7a8e57494fb9e190a02924ce0e269135695cac79b100a0c8580af1c96
font_01_sfnt_off00011a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001323c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323C 10816 bytes
SHA-256: d2d00ca0b4164f1f3a191292cbe0ae60e19c31fa47a304329fecf355f5761fce

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