Malicious PDF — malware analysis report

Static analysis result for SHA-256 109dd762ec46eefb…

MALICIOUS

PDF

79.3 KB Created: 2021-09-12 09:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 63c1079627f5aea83264b0463b99003d SHA-1: ad107ffe85bc8b5e8a9e46a4c82235c2e1df0576 SHA-256: 109dd762ec46eefb8a65d0bed865929a862d708832569579d5f49196382848e7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with several pointing to disposable hosting and potentially acting as a link farm. One URI specifically uses an IP address, which is a common tactic for evading URL-based detection. The presence of these links suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crewmak.ru/uplcv?utm_term=signal+app+notifications+not+working+android PDF link annotation
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613d826e3f422---41397800961.pdfIn PDF document text
    • http://bulmarconsult.com/files/9664265443.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613791654aa47---24087383363.pdfPDF link annotation
    • http://www.lbtfilm.com/uploads/files/gajojutewonidaviw.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/80090925919.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/28568060258.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/welatodevifurufor.pdfIn PDF document text
    • https://kenadong.com/contents/files/napovifo.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/18547942952.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/masovamelujod.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/fenedajomasopamugepa.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suxudejizewokumakawuxev.pdfIn PDF document text
    • https://laps.pl/userfiles/file/97859925328.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/dekojaroru.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/21718605169.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/60494712350.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/84801700821.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/73892917396.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f075842fda---92642207976.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/14155046505.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/80748392482.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_off0000d0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AD 17384 bytes
SHA-256: b036b562abe31044884cdb9628a55740e0fac13427207642d9f83d3693b6aea9
font_01_sfnt_off0000fe68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001167f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167F 10916 bytes
SHA-256: 84e4672b8db03fe739cffbc054dad86af6188c500f5bde338e1a7b7033fef840