Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ef5c28853ce847…

MALICIOUS

PDF

87.9 KB Created: 2021-09-09 09:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad26fb2eec4bcaff25ff7d99999244bf SHA-1: 2e6beaa4e4f0f814534d808d5015fac68eafa5b7 SHA-256: 76ef5c28853ce847309290e4c2a9100c8839a256eca2cb83cd7d5a88142e5056
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The primary function appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://netmode.net/app/webroot/uploads/files/39349947646.pdf In PDF document text
    • http://synerfreight.com/syner_upload/images/files/vibatuzisuzewex.pdfIn PDF document text
    • http://krzeptowski.pl/file/70580060450.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/99654974281.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/39528069714.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/51973764604.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/89878433459.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6e36a344---72152894006.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/vofazobewim.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/22472752719.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340b90ace11---viwikudurexalobimo.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/sulukevure.pdfIn PDF document text
    • https://negaratoto.com/contents/files/kizan.pdfIn PDF document text
    • https://stotex.rs/files/wewakadetim.pdfIn PDF document text
    • http://novichiha.ru/pic/file/59159014885.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/95818646764.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/suwolawonekudozowexonada.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/numodufulo.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210906124805.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92470321369.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/3327158080.pdfIn PDF document text
    • https://linardi.ru/files/file/6679004295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=big+cash+mod+apk+unlimited+money+downloadPDF 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_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 19328 bytes
SHA-256: 1df287072ae3b9eaf713f7228f7cdc86dc2f7b2f924fa9a5e13afab8fb02c7c0
font_01_sfnt_off00011fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D7 11304 bytes
SHA-256: be0166e9ce03b63286f04c9c307da881c3baa6f65eae9a5aba6144d5a1810818

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