Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4dbefbc5d816df…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 12:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fc5610d4c182bfb772166273520d897f SHA-1: 318d892be61f8a48de7797de02c1141fc9a0363b SHA-256: dd4dbefbc5d816df0c3cab18d7c86cf4e2c0d4a01566e785c6bd553dc257d0ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of multiple external URIs and the overall structure suggest an attempt to lead the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://tttinox.com/upload/userfiles/files/8999322335.pdf In PDF document text
    • http://oawebserver.com/piceditor/file/22995023259.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/deriwakeliribabapenejoxo.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/34503017356.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/l6191mjjbd8modmv8vil1n8mj1/99317900753.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/78914988136.pdfIn PDF document text
    • https://menu2uplus.com/images/file/2543482599.pdfIn PDF document text
    • http://suurelepa.ee/data/file/veniwigupatomomovufekuzot.pdfIn PDF document text
    • http://119pump.net/d/files/30893779333.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/besatoxosunawemubul.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090422002673499.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/36694599502.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/kozubusevefijosog.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/68822669781.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/sapupebuvumanofog.pdfIn PDF document text
    • https://pisausakti.com/contents/files/80528198404.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/25737127849.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ee35320ae2354c4f2548208b376453d0/85619215604.pdfIn PDF document text
    • http://short-story.ru/upload/file/nevogibolaruxotute.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/61241585739.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/40185791703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=puzzle+survival+mod+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_off0000d7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 10668 bytes
SHA-256: cf64f1056a1ae6a8ebb975f3bf84db33033da5418a73e1365e0a4ee7bf2f857e
font_01_sfnt_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 18248 bytes
SHA-256: ba5af53c21ee29601d4e6b4cdc8abb2b0f431d0fbc90f83d08cf680acc8953c5
font_02_sfnt_off00011f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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