Malicious PDF — malware analysis report

Static analysis result for SHA-256 96641cf2835353d6…

MALICIOUS

PDF

71.7 KB Created: 2021-10-07 16:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 672bf5f82a2716959df08b5d0915a233 SHA-1: 1900aab54cd97da352b710494510f8a4088eb217 SHA-256: 96641cf2835353d695ff7f1ccb20a9b87f0ced63da9883f776614a6c0a1758fc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a high number of external URIs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true destination, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=plants+germinate+from+seeds PDF link annotation
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/89177606595.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/xolimuregesitizixufu.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/sedifimubavafezelimoku.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/49353288947.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/17114793468.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/79487776126.pdfIn PDF document text
    • http://battle.bpv.su/content/files/files/daviranomupela.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/13012146207.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210921072246.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/37609049678.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/35142459956.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/43620826519.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161307e3631c1e---12826529964.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///98847296851.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/82507871255.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/41528104063.pdfIn PDF document text
    • https://digireg.at/upload/rupoxugav.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20211006_B738AA40A4C4FDF3.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/70621045289.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/wapijub.pdfIn PDF document text
    • http://gibisch.org/files/files/javisijufajamisojisa.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/84480050618.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/46925703397.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_off0000b963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17A 10700 bytes
SHA-256: 70bc25cc559160c874030f5d56d30d2c347531c609b77f87f627ff5824f057a6
font_02_sfnt_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 15488 bytes
SHA-256: 6deab5012b432dd79b696092bad5d6ef11ee9fd327ca6c7fd6f365c4c7e1f273

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