Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed4c259b8f60acd…

MALICIOUS

PDF

72.0 KB Created: 2021-09-28 22:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 790c00f52e9e7ab1feae42f93f112ff2 SHA-1: f3c557b83f0d51390374022e2cbb285c633301f8 SHA-256: bed4c259b8f60acd0d5ec527b127c49910d00d64bab7c784fc7e23973199ce63
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 external sites, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a large number of links on such domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://s-privod.ru/userfiles/file/19345463751.pdf In PDF document text
    • http://myxroad.net/upload/userfiles/file///70177917682.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/79584245848.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/94505701896.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c81994bb9e---mezijomegenivi.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/diwezivorajapoxus.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210921/file/86899060557.pdfIn PDF document text
    • http://synhbio.com/upload/files/79561962742.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/46480866363.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/nosijadepuzojozevinamu.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/delaxiw.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/rixibe.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/legomisurosol.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/vofinuj.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/9995614227.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/83293557093.pdfIn PDF document text
    • https://pecsikult.hu/files/file/pazafuripiguv.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/9hqo7s121hm7vmk5qv4424tsh2/62497431858.pdfIn PDF document text
    • https://strechybenesov.cz/content/72623310717.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/tokugorikitaguzaxik.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/28481900816.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/80026636555.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/48776926974.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/69917312693.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/51207341001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=retrieve+photos+from+old+phonePDF 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_off0000b460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB460 17656 bytes
SHA-256: 0c055bfd0600a8e4b251665349ea3ff7eead75a76ba0402f3e636b6cc6626f9d
font_01_sfnt_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 10712 bytes
SHA-256: 733452cd02b67ac2fd79ca0171f0551dfa08e985ec2fe0aafda228fe96d68103
font_02_sfnt_off0000fa53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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