Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89f0b8d136e99e9…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 02:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6a886e5a641aceb8669d3f747cc610d SHA-1: d97e1e9fdf86cc9b28b2da863cabfdab3fa68fc6 SHA-256: a89f0b8d136e99e9e5be6ea1a65378af440dc1ebfc9927fcaccfd2c6b4a45e85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the link farm heuristic strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nomylo.ru/uplcv?utm_term=stock+and+inventory+simple+apk PDF link annotation
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/toxegatuterugipadiwuliwox.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/nizukonebujinurikuniji.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/69904264282.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/jetasajik.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/jimifinadobulusebuduwupax.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/jewogotopixudib.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/36909601084.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/46608449042.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/99238017426.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/limewivuwezudufupa.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/feluxudumuka.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/2271472202.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/dafititub.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16305651213081.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/65004568215.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/rixigok.pdfIn PDF document text
    • http://zmz72.ru/files/file/nibotedopifokobamijotug.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/79047094120.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/58174397967.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pgc25dtvucm4ea4qr5c1sonrkk/xofomosoxezatiwizuba.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/gubupunup.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/59172012162.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_off0000c8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EF 11020 bytes
SHA-256: 6576d50fc52b04ae79d07396820a52d7fdfd7863cf9c737e12de0b08f15240c7
font_01_sfnt_off0000e29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 19408 bytes
SHA-256: af40a8458478131e922b6d0182bbe7be666339244c43c9248c805a9e233fc81e

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