Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f66b46eaeb9c51a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 23:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15ab43a5aa85b10fdc4f95f5a28544c9 SHA-1: 9513844aaf47a9e6685856f7dad7d67ad50f72c0 SHA-256: 9f66b46eaeb9c51a6bec923f6cd39bd3c80a03d5b88403a1d9ed592da8b4c1fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially untrusted domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a tactic to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://kiko168.com/UploadFile/file/20210906012906032.pdf In PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/nalonaretoganesubegupimu.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/21688982681.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/91944498295.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/nifobawunexamonitoko.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/75425915737.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/tupofegimovipimunidenipi.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/sobadejemomababipem.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/d157e336497452408d7e74f3017408e4/rirutupasewonodubisuju.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/jajaserasorufuvijaviragek.pdfIn PDF document text
    • http://canadianrockies.info/files/file/47415754226.pdfIn PDF document text
    • http://allasclub.com/campannas/file/57567730375.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/43976873571.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/59319455759.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/41140252897.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/peresakatix.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/98228104273.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/nupokexugamalam.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/54096018367.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/42631526557.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/firoladokozidasem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=yu+gi+oh+duel+links+download+androidPDF 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_off0000d354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD354 20344 bytes
SHA-256: 8407902f98ffbad1f3131677ce1522b6b7578daba4cff7120124e621ee976559
font_01_sfnt_off000108a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A3 10688 bytes
SHA-256: b37ee30333702aeca6628cf45ff7ba0e15a4c8a6f381daae817500fa53347876
font_02_sfnt_off000120df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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