Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b858bba231ccfd4…

MALICIOUS

PDF

78.6 KB Created: 2021-09-08 23:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f83decef9883b6369c1130f45cc66cc1 SHA-1: 75a35f2a4811838bd0f24f672c09bcad586b358d SHA-256: 4b858bba231ccfd430a409832d8952d186dcaedecb87abd1639a9f2d558e3f2e
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the primary purpose is to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=william+henry+pdf PDF link annotation
    • https://kanalprofi.at/UserFiles/file/47400398429.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/524746025.pdfIn PDF document text
    • https://amgaa.org/temp/files/69389414791.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/gorijimenasasexesiturelok.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/kiwatigisarezadaselitoxem.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/1ca0b25b0d9c411b4d864227ced71b88/89106786267.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/37025083786.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/65594686647.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/73460951226.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/88375165238.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/86512380091.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/sakozot.pdfIn PDF document text
    • https://titishop.co/upload/files/rixajawifitelulot.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/jejudesuxajo.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/0cfcaebe0d7e24fc1b845b57aea02060/penaravivijimulexuwifusiw.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/91046351928.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/gubuxawaziv.pdfIn PDF document text
    • http://belean.pl/userfiles/file/pelipifowepinakogowow.pdfIn PDF document text
    • http://cycling-software.com/files/file/nilabedumovipusefejakavar.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/36134859978.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/68337412526.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/64280094718.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_off0000cdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 10484 bytes
SHA-256: 4b40d433ce9e761fa8ce03061b50c7cb149c9f82403f9ea7fbcf0de22c2e3b1d
font_02_sfnt_off0000fd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8C 18280 bytes
SHA-256: 0edf37e32a65f23989de24b01d21f6b4ac370b47e45f1098d122291548204a80

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