Malicious PDF — malware analysis report

Static analysis result for SHA-256 47479150cae6bbce…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 21:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e12cc9759d18f3a2dd7a6ee5b60f2ffb SHA-1: ad437aa237c047ded056472fdd8fd0a3a5e0184a SHA-256: 47479150cae6bbcee73a3bc3ee5ea388405df574d1fa058207f3c976a180f210
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this behavior, suggesting an attempt to distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=wallpaper+android+18 PDF link annotation
    • http://bebaldebaran.eu/userfiles/files/13376606752.pdfIn PDF document text
    • https://forumsevens.com/images/file/sabez.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210920104551.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9292e015c---1111641674.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/63278082090.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/movewisuxuromexiv.pdfIn PDF document text
    • http://isvpro.com/custom/files/potin.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/80708232841.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/xenijodonizo.pdfIn PDF document text
    • http://state-lithium.com/upload/files/mununajanezifalaxutilep.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109090330594186.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/juxuvosibod.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210905110422.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210905_DF45A0F562094C9A.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/28009175630.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09140b089---65384233547.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/40613919002.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/sakidodegabikesogibebuno.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/ximekunijutewetuxelefok.pdfIn PDF document text
    • http://chicopharm.com/upload/files/xerenagijazezikowunefi.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/dojezamozimatuzevina.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_off0000d67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67F 17196 bytes
SHA-256: a03b1c71a912a9466c48dee00d9516d93e911d06faa66b5fdd76fe2d695c17c0
font_01_sfnt_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 10372 bytes
SHA-256: b6cb7286b315e549794777a15ec25317252c05c6f30c72c69d302211db2f6bce
font_02_sfnt_off00011a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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