Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bfa6e00eb1b104a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 04:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d503f44fdabebe3fb28e4a503a18fc9c SHA-1: ce2e7d637a05307f8c48f34a265848a8a4a8f632 SHA-256: 5bfa6e00eb1b104a0eca07859bb3f4d3193a9c211a8dd4984940264899b48635
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were extracted, the structure and URL distribution point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/guwololane.pdf In PDF document text
    • http://fkhd.cz/data/img/levovulu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94ace74b7---94961085092.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/98970718205.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/gejatobalire.pdfIn PDF document text
    • http://insei.eu/userfiles/files/tizowunifosoxagetukuxu.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/6673338077.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109092046185194.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/tugajagebekajed.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/26324487935.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51021536148.pdfIn PDF document text
    • https://path.mn/userfiles/files/zudujibiwuwuripar.pdfIn PDF document text
    • http://fabtur.ru/upload/files/22988645037.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091816031753.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109191314463449.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210911_4E7CCD9FFC3CD9BA.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/nekefa.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/30820621195.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/81059436533.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/11414438883.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613435551cc93---2690506481.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/baxepu.pdfIn PDF document text
    • http://stylekd.ru/files/tizabunebomulomobukok.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/35429725072.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/sosawukesipip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=minecraft+what+to+do+in+netherPDF 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_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 17220 bytes
SHA-256: b4a480c02d72420986735d35e07aae8cc8eaf8e29a7ae518f71b8af0e8e60951
font_01_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F72 10436 bytes
SHA-256: 707f5ebb2f2ff2ef67da90b879a0fbdb2a49b461e713147e2d4e0b1ed627a26a