Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5583cb9e44d532…

MALICIOUS

PDF

74.7 KB Created: 2021-09-13 23:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e4b8ce29d7003facdeacd3ff87a4aa0 SHA-1: 61ca260329fc084c044222fa66ffebaba3ae677c SHA-256: 5b5583cb9e44d532f72cc8811987f97f1ab73922439feb78277d5f84d457bff5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable or low-reputation domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document's primary purpose is to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=rush+hour+putlocker PDF link annotation
    • http://nikolalepojevic5.com/multimedia/file/4304594445.pdfIn PDF document text
    • http://soc-in.com/data/media/files/jefimemupibino.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/navalisawe.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/sewanodukoronun.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/98915063483.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/47839570302.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/89986378851.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/92927488158.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/3765323956.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/popoturesabolun.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/75052297958.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/25903804878.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/95301841675.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/13313752295.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161317816e02a6---61155375410.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/totasa.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/23052345885.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/82934325484.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/45725437750.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/71617099918.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/miwozesinivuvugifeje.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/lonadotozajixarajediwa.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/90466980798.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/sopobawemimemodobobiwoba.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_off0000bc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC10 10352 bytes
SHA-256: f93dd1848a80cf536028c3c0992c4412b62e1c6c22bf6371c4962b149cac80cb
font_01_sfnt_off0000d3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 18932 bytes
SHA-256: 71eb8ce259b94eba7b53df1699e253e4936131bbf3a5bd3507bac9e5850136d6

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