Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9cc020e1126c40…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 14:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab75999b44485feafbb89e174d722842 SHA-1: ae0a938890fa796bbec7454990b4fd3cc671a476 SHA-256: 1b9cc020e1126c40d36b04183b8f70326c83bb5def21f0b35b2aa83315db9d39
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high likelihood of this being a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The file's structure and numerous redirects point towards an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fpole.ru/sadm_files/pemososizesufipo.pdf In PDF document text
    • http://esistore.be/userfiles/file/busibigasupabisozi.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/wedowipujizorexeketadusi.pdfIn PDF document text
    • http://princeverma.in/uploads/files/18190603457.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/54707299473.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b739a336bf---96175754220.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210913103616.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/mifetifalaxowara.pdfIn PDF document text
    • http://runhouchem.com/upload/files/wesiderojisijokekakutokav.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/83822682015.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/mikavefowurana.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/17373766567.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0f78de39---47702074857.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/rowodeten.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/dutudur.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/zugiv.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/jijixogovobewikoji.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/dupokukibu.pdfIn PDF document text
    • http://01host.ru/userfiles/files/jizirerilojuz.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/76761592042.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/63335572898.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/jeriza.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/wateram.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/72375828517.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/luxexemeboxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=long+screenshot+app+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_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 17588 bytes
SHA-256: 4a646fc611f4c5024fa45436011decf7e90fafbfbdd9d240691df56d49c88584
font_01_sfnt_off00010c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001242c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242C 10704 bytes
SHA-256: 8549a7a54cb354b20438d07de95ae7a576ab9f9b3533d37333e90820c3fc35eb