Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3795356b4a5b7ca…

MALICIOUS

PDF

69.9 KB Created: 2021-10-02 18:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a499985a65641fa6293d5a1e280f410d SHA-1: a2ac2a7216935903cc67d1baf5c4beb8f4e462c8 SHA-256: d3795356b4a5b7ca130d3c0b67da2b1bb705fe4ffe7a6c41d25ba34f52887981
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=which+statement+is+true+about+organic+compounds PDF link annotation
    • http://nutronicltd.com/userfiles/file/lenagurabufevatapebugavi.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/88536179523.pdfIn PDF document text
    • http://slsnn.ru/content/files/xojudomejoveboritosudemig.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/6857311203.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/walerosanabosiveli.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/fexolidulizuvojiguzuvisuv.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/5445701862.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/59337831952.pdfIn PDF document text
    • https://chothuexeninhbinh.net/data/dulieu/files/zikotasejalivatepepawilum.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/vilirezifijiraxe.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/46fe572f1bbd1507ceab90e47846975b/99054887636.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/vutanezujisazulupulewa.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/pusikuvowavukiwetoxikole.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/puwufepokug.pdfIn PDF document text
    • https://drterrace.com/london-100.com/userfiles/file/99288678026.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/29705004747.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/70706663234.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/18807466857.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/11014140784.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/losarir.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/662bg9flu1f5t0mmjr52jd9v21/30427302955.pdfIn PDF document text
    • http://aquatherm-graz.at/files/vagef.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/14099465224.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/17850619212.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_off0000b2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD1 11148 bytes
SHA-256: b73b17f5113ed7b3572b6277fd8efffb0d0fac8cc075c3bcb1d7b780ab9eb8c4
font_02_sfnt_off0000e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 14740 bytes
SHA-256: 9fc754dd552c60c5a6890159a0037ed2788e122db0de52d7b0e4b58bbfb9ef77