Malicious PDF — malware analysis report

Static analysis result for SHA-256 85da93c6d9995d5e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 17:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47b86a11eb7e10338eafe8f7705cb760 SHA-1: d71535be3d01534703853e0874a68425456cc77e SHA-256: 85da93c6d9995d5e8c37b6157ab6baaaa0fe98095713f0760d503dd90ede7852
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further indicates a pattern of using disposable hosting for link farms, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pomelieagency.com/userfiles/files/bivanewifimifotavapu.pdf In PDF document text
    • http://tamker.hu/userfiles/file/34698808252.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/vadebipofut.pdfIn PDF document text
    • http://demkapi.com/resimler/files/54910857678.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/84048246573.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/11965234095.pdfIn PDF document text
    • https://jdconstinc.com/ckfinder/userfiles/files/15710414327.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/63329437940.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/vijojerevokugaw.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/22323739091.pdfIn PDF document text
    • http://hkwwta.org/userfiles/96244860710.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/20780582320.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/dupeviwut.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/79349446123.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/gusetuzexip.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/gexonasedujejo.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/temabedulesuvuxamisozeped.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612edded17509---guxezudomajiri.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/vebazejedu.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/kosenamunobe.pdfIn PDF document text
    • http://esangsok.com/upfile/files/gudofitobimalofavovepip.pdfIn PDF document text
    • http://allier-genealogie.org/File:/wezasezinekewupasurig.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/vonevudadoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mw+dual+space+apkPDF 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_off0000d016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD016 19776 bytes
SHA-256: 6decd7b805f429ea0fe7918aef71e86fc1bb411eba542e56e2ff1272fa5cce41
font_01_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 10264 bytes
SHA-256: c6977f4f4169d2f93167e45d0a33fbb37f8fb5160a46036e769a8a0a343080b1
font_02_sfnt_off00011b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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