Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c73bd15fdc45463…

MALICIOUS

PDF

76.4 KB Created: 2021-09-21 16:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b4258a41e13e0d7ade62b996bbd9130 SHA-1: 9d6d57bdccf0887a1e1a6e17e66f712fdc72d202 SHA-256: 8c73bd15fdc45463117081b0843664e82bd7c345a156b8b9ac0c07e18828f415
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating the PDF is designed to host many links on potentially untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://huntic.ru/uplcv?utm_term=lazy+iptv+apk PDF link annotation
    • https://masihpt2.com/contents/files/xozevetazevelakefefa.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/98496457352.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/bikarazenivu.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-18-08-35-39-67.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/68457089973.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/xigukuxegowudafejakesit.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/xuvom.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/gamokawixejilaxurabaw.pdfIn PDF document text
    • https://reniuved.it/file/24942133208.pdfIn PDF document text
    • https://andhimazhai.com/images/files/34102615633.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/zafoxaka.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/ririgenuzedodajuvux.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/26101469474.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/10428826768.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/puzinikorixagisolo.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/ruxukoso.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/29388802077.pdfIn PDF document text
    • http://saydersan.com/firma/files/89882115328.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/76303226103.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/sonotodiposebezaluwaj.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/josivanawogafedas.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/64866423214.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vowomodexobofevigiz.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_off0000c8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F7 17500 bytes
SHA-256: 33f9664be89d23bad59a1a6f3fd19fa4646e22b07597ef013d149e052623fcb7
font_01_sfnt_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E25 9864 bytes
SHA-256: a26469ddc0553aa4ba5b21a0cd89f1bccbfa5d8253e6f9fbc47f3e224a6f3b2c

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