Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2150511be72a3af…

MALICIOUS

PDF

71.9 KB Created: 2021-09-19 20:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae33f687b2916d8946d51af4551b1a1b SHA-1: da8e3b6cb5a2924306e93d3bff5060c426e49e95 SHA-256: e2150511be72a3af990111aa63b9c50aa641f3bf601fccc5638fdf0331d7c7b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent to distribute or phish.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mayxaydunghoangphuc.com/userfiles/files/61076019941.pdf In PDF document text
    • https://stephankeppel.com/userfiles/file/fapud.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161418548b08e7---dasosirapinupadofemik.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/41829081425.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/vusizatesuz.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/loxubosevafip.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/34400358363.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/ribagerujazuwefiwelisurab.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/93311852429.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/lewaxifukebafonesasoku.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/60292202871.pdfIn PDF document text
    • http://markone-tools.com/upload/files/sejuwire.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/43959637615.pdfIn PDF document text
    • http://smirna.pl/files/file/zonelo.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/19028524801.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/51599391892.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109091428277803.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/93712572456.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/54518645562.pdfIn PDF document text
    • http://kotolantopeni.cz/file/77512851298.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/gemuxadevovawisadarakus.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/91640794936.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/62316146244.pdfIn PDF document text
    • http://katela.net/userData/board/file/memigos.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/xupokixezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=degrees+to+radians+mazePDF 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_off0000b8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CA 15972 bytes
SHA-256: 610d4e072a5b0259b85e05a040deb47a5a741902c237fa99a51d45a864b44e39
font_01_sfnt_off0000e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 10604 bytes
SHA-256: e11ba4ee5c121a8ce55952a689ad6731910a00fa51541b8305e4dcb0b8522777

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