Malicious PDF — malware analysis report

Static analysis result for SHA-256 27bc3720982ca06a…

MALICIOUS

PDF

75.0 KB Created: 2021-03-05 15:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 522b733d9e0d2d0b7a47fa8cfe28028b SHA-1: 71863d910d0b5e4016793bf2a0c96a0f843e29c0 SHA-256: 27bc3720982ca06aa230a7049dbaed96b6330eb44357624f8777962c5d9b1a11
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, many of which are designed to redirect users to other sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=how+many+ounces+is+a+dunkin+donuts+large+coffee PDF link annotation
    • http://bewewafip.scienceontheweb.net/71754674199.pdfIn PDF document text
    • http://xufamorazogubov.sportsontheweb.net/what_is_a_safety_dance.pdfIn PDF document text
    • https://cdn.sqhk.co/dorodidur/ejgkigh/dokkan_battle_super_dragon_stone_5.pdfIn PDF document text
    • http://frut-tree.site/17482900846e3ooz.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/dD4jege/fepoledosabuku.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/ijrnKAa/86790814409.pdfIn PDF document text
    • http://copyright-help-report.com/what_does_a_void_mean_in_law2jg8o.pdfIn PDF document text
    • http://liko-sneakers.com/4186332007gfqvy.pdfIn PDF document text
    • https://cdn.sqhk.co/libodinidep/jhVjfii/14681298995.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/the_lord_of_the_rings_in_telugu_full_movie_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/cicuw9a/wukowujij.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/46654963303.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/1001_nights_hookah_lounge.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/hg66iAM/spades_plus_online_free.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/47114450307.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bupalim.atwebpages.com/puraxowurego.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/bomiwugekir.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/68326001932.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/xozikovarobujedoranutajo.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F7 5560 bytes
SHA-256: 67deb1ca67f4afe989133abfcf353a88e18953a0bcf57c2a642e68170a251676
font_01_sfnt_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 10732 bytes
SHA-256: 67342e8c5e527ba6af40dc6af77f4e366c634ad833c47d0e5ffc597f8da7511f

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