Malicious PDF — malware analysis report

Static analysis result for SHA-256 747d025efc8930a7…

MALICIOUS

PDF

68.9 KB Created: 2021-09-19 15:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6c48badac3c6e67cd7dbc509d9d5ffe SHA-1: f9697e6ead02766baa8bdac1bba7977691fec264 SHA-256: 747d025efc8930a756cc9816b23ef170882ef74ba832c85ba1650b35fc39bed7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The primary attack pattern involves luring users to click on these links, which are designed to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://sinice-rasy.cz/files/file/liwebuzasolupunebitoxoju.pdf In PDF document text
    • http://www.pvvc.cz/files/70678583961.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/kunuzowasitowavatug.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/49448544399.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/54881756819.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210909162844.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/35037255624.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae1bb0fa6---9696582385.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/30235723724.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/pemafofokimek.pdfIn PDF document text
    • https://12shio4.com/contents/files/42145492865.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/fodigi.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/dowogalozobasafudumigatek.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/41015920722.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/85386173172.pdfIn PDF document text
    • https://seikai.jp/free_images/files/43398270218.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/25414754667.pdfIn PDF document text
    • http://zuszdounky.cz/files/lotogekiwinisatolamet.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/29288388448.pdfIn PDF document text
    • http://renknh.com/ckupload/files/nupofugapapew.pdfIn PDF document text
    • http://venkateshservices.com/uploads/nefobutanupuzowo.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/midalaxakazivowukilo.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/dupajokusamufawanapubosil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=tumile+free+coinsPDF 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_off0000b442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB442 14076 bytes
SHA-256: 02c9584e6fde20e6e04c80c39bdb09a92d44399d0c7b9285c71d1f1e40025aea
font_01_sfnt_off0000d716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD716 10300 bytes
SHA-256: 878f131563a3b3a4729ecbb04fc7d398ba2574a100c02f870bded48f85d0805f
font_02_sfnt_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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