Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21d2219745525ab…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 19:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c93e3873f98c644b2a955be8c2ab0799 SHA-1: 2894cb4aeae69c5cd07fa4c764c24456f81caa04 SHA-256: f21d2219745525ab45988639b2cf43ec10ded0719a878cbca082d884f33e85e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to redirect users to potentially harmful external sites.

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://bevasilicones.in/userfiles/file/26233681125.pdf In PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/94647779068.pdfIn PDF document text
    • https://eguiders.com/uploads/gunirifidufufofonegon.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/rakadamufi.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/22878591023.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/67815181092.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/vabaxoxosojejati.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/betafixat.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/50678696299.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/60168616050.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/15090248437.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/38779090623.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/wanewobolisowesokugu.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/rojigonirewiwiledezofowav.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/sukobukaderegijexupilof.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/wovewivalenepelosipa.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/gutumijubeno.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/topaxiroraz.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/ruvitoxapabomem.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/jozugezupisasab.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/tagawasupawizetoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ways+how+to+get+free+robuxPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/56490145811.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_off0000acce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACCE 15296 bytes
SHA-256: 0ab0e95d2913550ab85f22eebaa933af9ad07da2154a5199db85e11750662649
font_01_sfnt_off0000d327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 10784 bytes
SHA-256: ab074b057cd2b8263148fd47ce07cb0cebca66960e1e739ba22b8e143846f649

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