Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e009a6a298faf98…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 11:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca578b414b77b7bcaf2a90e80ae31ad5 SHA-1: 5467564feaf940dcd7d49d4015b71de07a214d9d SHA-256: 6e009a6a298faf9818f6a6a6020226489dd85fd0c157c49b939b6bb90a1ec79a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a large number of links pointing to potentially malicious or phishing sites. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://nomylo.ru/uplcv?utm_term=google+webpage+translate PDF link annotation
    • http://korealabels.com/ckfinder/userfiles/files/besakasole.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/98331318026.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/24961526282.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/gowajanixepabuponej.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/051604405151.pdfIn PDF document text
    • http://www.siposferenc.hu/html/65015358933.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/nimusus.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/mowagoridu.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/mugaju.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/buvixesumilomuwowutenulop.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/xivep.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/tawenov.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613164f23fe96---75507312550.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/tidukedazunaw.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/33256448075.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/fisariwenosizo.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/38518346380.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/65920619754.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/53270823404.pdfIn PDF document text
    • https://advik.net/userfiles/file/44534346451.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/sipuwuburobapira.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/toxidatasofigarezurozonim.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/64409766876.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/pudarusik.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_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 18384 bytes
SHA-256: 555d284fd29a4791585c6a4c5b3e93569ecfc84ed7b431305b9198e641a0c715
font_02_sfnt_off00011f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F32 10600 bytes
SHA-256: 182544681bd76f6c9b873e2a0da4454ce0bf2de96b77b7aca9f8f67913c87cca

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