Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8fbd9f8e889142…

MALICIOUS

PDF

99.9 KB Created: 2021-09-20 00:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 891b9e56d9a98c474b2b5cb0277952e3 SHA-1: 1e4a1cc8a8d6a51ee9186b9bb9f020361160545d SHA-256: ab8fbd9f8e889142b2cc2293286ec1bdfbb9c886fb7f54f3bf3f3296afc084fa
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://krisoc.ru/uplcv?utm_term=download+pokemon+platinum+ds PDF link annotation
    • http://smartickgroup.com/userfiles/sunevudemujuwujejasope.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/wuribiketenusunetamuta.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/zovigirutakupoziwe.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/kuziron.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/lunol.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/82724182231.pdfIn PDF document text
    • http://isvpro.com/custom/files/bibajedutomul.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/kuronibezikujopego.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/30088352132.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/87045913906.pdfIn PDF document text
    • https://fond.ru/userfiles/file/tewuvezupinokif.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144fa410a2a1---22347467085.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/3961169638.pdfIn PDF document text
    • http://master-br.ru/img/file/rigodizawawemijajawoj.pdfIn PDF document text
    • http://machulski.com/public/file/momuminoxokamo.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/rufupinosig.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/rodukumajaf.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/mukivenagetadaripinakuwem.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/42507591462.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/xakutepuxonizesigap.pdfIn PDF document text
    • http://rapet.hu/files/63654654875.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/zibanosanuduv.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/nugidabezepigikilibejod.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141384c4052d---43983682415.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_off00011b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7A 10732 bytes
SHA-256: 13e42029f06a5be42f42cedd13a65a7e4740d567abc3c9714f2c64775734cb44
font_01_sfnt_off0001342e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C40 20360 bytes
SHA-256: 573bf8a797bea5da56fc6460fc1924d51f70b6416b32533ad5cb642ce16925d4

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