Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d501c57471dfc16…

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 06:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6fbb72651ad734264e60ff5c4cc1368 SHA-1: 45525f0193bb5ec1515de89b535f6afc563751d9 SHA-256: 9d501c57471dfc165ac936a852d3732e6bab8dbb1a752d450c89ad0d0b5b30c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The PDF structure and embedded content suggest it is designed to direct users to external resources, potentially for phishing or malware distribution. No scripts were extracted, limiting the ability to determine specific execution chains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://manu-transport.com/documents/file/31082773306.pdf In PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ffb001399---sametugakaret.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/45124019903.pdfIn PDF document text
    • http://risme.vn/files/dilelixekug.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/24827756998.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/zazetosazoxig.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/genodefu.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/42581750913.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/megito.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/75905166269.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/91566592575.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/rawufuwaruduxiximeka.pdfIn PDF document text
    • http://chinahongji.com/d/files/75989667086.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/rakavedeleziv.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/40266588369.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/ratebirogopibuv.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/depojimodotot.pdfIn PDF document text
    • http://dogable.de/userfiles/file/difabutetabaxafas.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/momekabosuxipofuma.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/80339750974.pdfIn PDF document text
    • https://almavilag.hu/files/files/71603635528.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/bogegupaxaxoleban.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/95233119527.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/lizifapakixafokoxaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+check+wifi+password+in+androidPDF link annotation
    • 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_off0000cb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB81 10740 bytes
SHA-256: db82edbc902f69ed0f19d7957a5e8522590457064c511b7e48e5006cbf8360eb
font_01_sfnt_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 17024 bytes
SHA-256: ef0b6d7aeabf7b81129ebea41a71753f79b73894b07a008542e0a172d4a55087
font_02_sfnt_off00011032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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