Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c66d00ab8248df1…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 16:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ccad058ae21cbf06cabecdc2d7ff333d SHA-1: 4105bf554bd19b73627743a1cc60caf96690cc2f SHA-256: 3c66d00ab8248df1a3472ad0d5ab38326674200ec175f6a6b08839ededb4d60d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of a link farm with numerous disposable hosts suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of directing users to external, potentially malicious, sites.

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 http://cimkezes.hu/uploads/ckfinder/userfiles/files/butoletoxevepigirazira.pdf In PDF document text
    • http://www.andreapondika.cz/file/rubemakogamulegigi.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/lijizadogapulomusovenamox.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/nufukikenep.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210904_A283A464E6104F0D.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rumod.pdfIn PDF document text
    • https://baglab.pl/galeria/file/wasiwutu.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/34400716643.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/78078519069.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/ziduwo.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/mitijadujukebi.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/xenumumozufupi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a938ee2d83---xajawunabaxogiwabukaxu.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/bolatenitut.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4e9d93bb2ef11d337b4c454b9a88b6dd/24037501851.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/1362151081.pdfIn PDF document text
    • https://ratosatu.com/contents/files/61460334642.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/kasubax.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/36415495511.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/zofix.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/96059162787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=happymod+ios+download+profilePDF 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_off0000d61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 17236 bytes
SHA-256: 3b8ffa07ee4d5b31460e624cbd5594a1627b9a6502aee912925964d0652543b3
font_01_sfnt_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 10752 bytes
SHA-256: b92ee17b96e18b37c0c6f4eb2f1ed86d1a1051bd67672e4cbac0d134ea0f6a1a
font_02_sfnt_off00011b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.