Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c424f93d674764…

MALICIOUS

PDF

85.1 KB Created: 2021-10-05 22:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 63ebec3f5d2e174fb23ef79d9a8bb7f4 SHA-1: 1e9aa0a2aec5cf08eb704e366d327ef6a93e3e3a SHA-256: e1c424f93d674764b345ccd453c5ab011362d05d936f8edf867c0b07569d8ce6
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, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains. The presence of numerous embedded URLs, many pointing to potentially malicious or unknown sites, supports the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://corising.info/sa_upload/userfiles/file/20211004101139.pdf In PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/jikib.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/81764086925.pdfIn PDF document text
    • http://techmechengineers.com/uploads/18748589748.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/32800846315.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/kadabidawovixawub.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/noxikuravul.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/mopavevasanur.pdfIn PDF document text
    • http://arsvet.ru/img/upload/76175036772.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/dugetevezuguxilul.pdfIn PDF document text
    • http://artospace.com/pics/file/32930385989.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/61723136723.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/90297785339.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/kuzasajazexutim.pdfIn PDF document text
    • http://cncsprings.com/d/files/86110929043.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/36252261318.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/88401577548.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/vanojedevikelul.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/97108816800.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/66385478887.pdfIn PDF document text
    • http://asustainable.com/global/file/17341672367.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/392941.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dbb2912f8.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/xevadolofasogoreto.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/46762261365.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/muxod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bob+marley+get+up+standPDF 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_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 11052 bytes
SHA-256: 7f610b4f0e4ad602ec70aa5745f7369fbacf5e34f917f62d8e6fbd5aea81db08
font_01_sfnt_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 20360 bytes
SHA-256: 0cf641c26fb629205da9cf9dd93dc798e079434c8aebba6e951b62cb65c77902
font_02_sfnt_off00012ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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