Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d492c51d25835a3…

MALICIOUS

PDF

93.1 KB Created: 2021-04-27 19:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e375f42b1d98f3bf04d65ae5d1541193 SHA-1: d9fbc30e04481e2565ab35575c98046fa0a2444c SHA-256: 0d492c51d25835a3f50025bb6c5a132cef3355a0dff5bb8734fe76f2bd68a33e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, with one specifically identified as a lure for a search query. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=how+many+calories+are+in+a+sonic+cake+batter+shake
    • http://sberbank.link/hp_envy_4500_ink_cartridges_3011kudu.pdf
    • http://xidakuxekon.22web.org/what_is_the_difference_between_programme_planning_and_project_management.pdf
    • http://henrysavbr.site/zeguvagojtok1.pdf
    • http://xizadewakali.iblogger.org/19132013929.pdf
    • https://gebedosoxabitox.weebly.com/uploads/1/3/5/3/135324181/7663339.pdf
    • https://pidolanapeg.weebly.com/uploads/1/3/0/8/130813957/3927237.pdf
    • http://tekdouche.xyz/17481422403turpg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8b7199fc-a029-4910-8138-caee300d1cbd.filesusr.com/ugd/da8f68_c852756075214aeb813827465caa21e7.pdf?index=true
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_82e93013fd014298978d7595af587a0a.pdf?index=true
    • http://nawuxek.rf.gd/jiwotis.pdf
    • http://pumejak.rf.gd/49901188015.pdf
    • http://balubusepebibi.rf.gd/81582959086.pdf
    • http://nametelival.rf.gd/picada_de_aranha_marrom_tratamento.pdf
    • http://ludabama.epizy.com/rakexag.pdf
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_06b7b6f06c6d414fa163ee4368ca1f30.pdf?index=true
    • https://s3.amazonaws.com/xofalepelala/what_is_critical_reading.pdf
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_7531748efc614ea2a78aa0e3489336af.pdf?index=true
    • https://s3.amazonaws.com/setigafat/fujixadul.pdf
    • https://s3.amazonaws.com/zaxawetawupo/deferred_tax_worksheet_example.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001138f.bin
bcbf940cb3dbbed9920c12919739a6b49710bb734883feaa8a3c2a07a57ace24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 5396 bytes
font_01_sfnt_off000125ca.bin
4c4828d1e50b8c81f2239052f24489df80d82998ad4117d49e17cff1aa4d9521		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125CA 12940 bytes
font_02_sfnt_off00015157.bin
cb0239a5e77cb37740da0b4997a5f47117ed526887f952b298c44ef8b2f17e18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15157 16232 bytes

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