Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e9396eaf836687…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 15:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1e4c7fd6ba5bfba3b0a716817d8ff39f SHA-1: 760d6a012b9ae8c644c427960c6a78a4b500c657 SHA-256: 36e9396eaf83668745dd94538a58b56ac32d29add166b556af539a5a37b060c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=pdf+merger+mac PDF link annotation
    • http://galettedesrois.eu/userfiles/file/jedaw.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/raxun.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161452c8f99d56---3410989888.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/tiresiforawubupemutel.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109120410159738.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/83395589818.pdfIn PDF document text
    • https://qud27rxl1-k61l.com/contents/files/50645960498.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/20919602554.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/54939399906.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/181b6c342bb38010b243b6d480287e1a/61602373516.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/warotafi.pdfIn PDF document text
    • http://dytac.hk/userfiles/52316704846.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/tisaresabelusufetupawi.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/finuxupidugo.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/norodazufugan.pdfIn PDF document text
    • http://vuason.vn/upload/files/fukibidilonelilel.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/guwazaxategem.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/fejavedu.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/45144421562.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/29559507850.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/99163357053.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/kimemoreferojo.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://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_off0000afdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EF 17100 bytes
SHA-256: 572a497efd023dda75dabf15510bf1f476a047118b10850e464f8030ed2cd1b5
font_02_sfnt_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 10192 bytes
SHA-256: 56f956218994c3b3bff11de7d11e2f1bcbbcadd358f8b90bafa05d1e24c53aa5

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