Malicious PDF — malware analysis report

Static analysis result for SHA-256 451a70f1f2796a80…

MALICIOUS

PDF

96.3 KB Created: 2021-09-14 01:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 304be239bcba867228381d89063d65de SHA-1: 2998d15f8a87c22007a90b2ec92fda7a3ad56d13 SHA-256: 451a70f1f2796a807c0b37872dcda93b3748b4dd4daddeea37dc6935fe82f68f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating maliciousness, including random and disposable link farms pointing to external PDFs. ClamAV detection and ML classification further confirm its malicious nature. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=metro+2034+pdf
    • http://www.prodomasa.com/ckfinder/userfiles/files/11432809966.pdf
    • http://formel1vermietung.de/userfiles/file/rufudotemowirurevilabodeb.pdf
    • http://sweet-sugar.de/images/uploadedimages/file/reneledusuzixovozajobobot.pdf
    • https://btegypt.com/file/fiteto.pdf
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/fovapunotenizajegejom.pdf
    • https://diarch.in/WYSIWYGImage/file/gaxerugomopetok.pdf
    • http://graviroz.hu/ckfinder/userfiles/files/bosolejulesazajudun.pdf
    • http://footstepfloor.com/upfiles/files/xekew.pdf
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/13534478972.pdf
    • http://www.perchegouet.com/ckfinder/userfiles/files/vokukifufu.pdf
    • http://symbolfoods.com/files/file///kafuwobejugelabejapiwotek.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a66bb7565---zefipaxo.pdf
    • http://jjkxmy.com/upload/files/202109021021239104.pdf
    • http://retailpark.bg/uploads/wysiwyg/files/zajokidukozovorawuz.pdf
    • http://kaupa.cz/userfiles/file/68010668958.pdf
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/26937137971.pdf
    • http://otpetye.com/images/shared/file/juwipaxevezivelixoro.pdf
    • http://kalikraft.com/images/file/91090468036.pdf
    • http://scea.edu.mn/ckfinder/userfiles/files/59953087077.pdf
    • http://kaus21.com/userData/board/file/44203849894.pdf
    • http://lynxitservices.com/ckfinder/userfiles/files/zolesox.pdf
    • http://elitaliaweb.it/upload/file/paxowi.pdf
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/70554455166.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001123c.bin
bef19825ee2b3853163f5c5097e659ea0f5d70d82775d632f45dc98138839be0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 19092 bytes
font_01_sfnt_off00014413.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14413 16792 bytes
font_02_sfnt_off00015c2a.bin
f54719390eacfcb192f22920434c1736dca986f32662e01e300d4f554cdc2051		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C2A 10404 bytes

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