Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8543e19af52326…

MALICIOUS

PDF

78.8 KB Created: 2021-09-10 14:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c6104471398c6c9f4aecef624097554 SHA-1: ad23970ffa742c3f76ad7fddcf9ccbfd9714b42b SHA-256: 9d8543e19af52326a12d263c6e506246c8b235e8d6b1082207b9f2890fe4a510
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links, likely to distribute malware. While no scripts were explicitly extracted, the presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ytdrive.com/CKEdit/upload/files/27607438407.pdf In PDF document text
    • https://omprintandpack.com/userfiles/file/34447264833.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/45601242930.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/wofanad.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/megineretebisabevipiduv.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/garovezawevosejewerojojok.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/bidexamobedifalowevanupi.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/28728646485.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/mevodukubeputudodonatepe.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/7429211413.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/51518632526.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/24217926686.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/47875377207.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/mozenokuwukebufuka.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/bopiwugolenug.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/gixuxozozobebumif.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/levevi.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/41014927614.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/bapoz.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/39818710919.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/34115700709.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/47500773883.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613253c6970ff---66661682999.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/nuredafarufonabaninepewox.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/66553281175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+supersu+pro+root+appPDF 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_off0000ce03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE03 18424 bytes
SHA-256: 16a01ff3bfd9f51deb899c8acd0055537ab5037894ee9cf2dfaf1220c31abc9a
font_01_sfnt_off0000fd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11555 10480 bytes
SHA-256: ec62c2f95fd25f447fca9831433668257c1c1ab43be678cf3ab6e89398d0562c

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