Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c65c44ebcbe51b1…

MALICIOUS

PDF

85.4 KB Created: 2021-09-11 17:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e7316e80172b59eabf1730780137423 SHA-1: 5d24bf55479153dc3d40533332e08733952a48ba SHA-256: 2c65c44ebcbe51b194e6cc86f91dbb68ba24b40ae43aa5568a435053a62518c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, one of which is explicitly a PDF file. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=how+to+backup+android+device PDF link annotation
    • http://ormansagszive.hu/upload/file/28797489754.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130c7f0d6ebb---durivimuxabidizanon.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/mufojafa.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/fozudawew.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/70080231198.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/nufikenepados.pdfIn PDF document text
    • https://theurbanthinktank.com/files/majabivudazo.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2d4635841---95962114060.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/36559504775.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/revibatewikovuwof.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/40760775229.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/15485217323.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23271352883.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/neluwapar.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/gixisemuki.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/bafevaxadebebaw.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/51131676612.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210906023329697970glmf4.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/jisugitosejos.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/34906959358.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/xefikoxi.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/wuvubafagobekokenojifuge.pdfIn PDF document text
    • http://julianina.dk/upload/file/9818296846.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/guweluxub.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/98757683131.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/rotamubosatiduwakofel.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_off0000ebd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 16624 bytes
SHA-256: d83e48beb81c5d4be5cb82cc5df62c822ec1f5cc0d0698cdcbf056cfd339a82b
font_02_sfnt_off00012ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF3 10768 bytes
SHA-256: 3e7503a981ff2315ff50b30ab9c2a2e95f63aee09aac7da27efcf1d57287f603