Malicious PDF — malware analysis report

Static analysis result for SHA-256 129a11c7107a39b3…

MALICIOUS

PDF

92.8 KB Created: 2021-09-13 23:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d1c2f7fd0b5b6f1b54d023f903f34069 SHA-1: 7f3530a579ff02a2c518d7d4146fdc187bf0fc18 SHA-256: 129a11c7107a39b375c7aa199a28a95d79723a7a5f562067e2c0ed00da3f8b56
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains exploit code or phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous external URLs suggest the document's primary purpose is to redirect users to potentially malicious sites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://daisytalavera.com/userfiles/files/9529801788.pdf In PDF document text
    • https://cicadit.ro/UserFiles/file/49544819811.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/21610601466.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/widijer.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/13945363414.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161315b2fa40f1---63045571451.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/a2a5p8lq8fileieki0hei7u675/54016707032.pdfIn PDF document text
    • http://ossokahve.com/upload/file/kowatalu.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/52801871092.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/razotutev.pdfIn PDF document text
    • https://allianztc.ro/files/file/zerazofibaduselemeturovo.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/97028036857.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/91483155386.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/fisofopu.pdfIn PDF document text
    • http://dsfly.com/uploads/files/45464383863.pdfIn PDF document text
    • https://krajkarka.cz/userfiles/file/38840240229.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/golirag.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/pimozolatix.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/riwamojekuwuzafurupo.pdfIn PDF document text
    • http://fgosvo.ru/files/files/86364093300.pdfIn PDF document text
    • https://jurad.eu/files/file/80632859025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=venom+1+123moviesPDF 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_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 24536 bytes
SHA-256: 0a0aab8bcbd21e14dfa412b566cb2c1f44311b883b8ae7f691117581a92db1ac
font_01_sfnt_off0001355e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D75 10240 bytes
SHA-256: b35167fc219680a5ab25544e6835ceaf0c9dd007a9f9e2441d3a7273e45f94eb

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