Malicious PDF — malware analysis report

Static analysis result for SHA-256 301759f9bb9b139c…

MALICIOUS

PDF

69.7 KB Created: 2021-09-24 17:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 24035602a0b82e12c4baaa2829d0b94b SHA-1: 52d72093d63c905a72a29a3e2c4c80578c3a84b5 SHA-256: 301759f9bb9b139c4b31e05dabdc0132fad16f889282ebb1f8bccce757470c91
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 numerous embedded URLs, many of which are on disposable hosting and appear to be part of a link farm designed to redirect users. The presence of these links suggests an attempt to direct users to malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=top+apps+in+play+store PDF link annotation
    • https://ancoraeducacion.com/images/3094199986.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/64866315325.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/jiveguzeposefigukuvove.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/1833f1c06d9d6e9c15a05488a2b6e348/86023113703.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109051823347974.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/paremuzivexidu.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/manojawokelat.pdfIn PDF document text
    • https://camphacement.vn/upload/files/zowokafopomiju.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/63119920057.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/41263488888.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/66766708900.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/bejesejesa.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/kekukujelov.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/xadeboxitidotojuzelirasu.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nababebukupitejod.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/paxatemujoma.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/mesabukefadafewi.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210915_EF8A03BA472FB580.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/sajarosezakem.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/xadap.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/zavefuwaf.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_off0000ad69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57B 17456 bytes
SHA-256: a0f82b2f541143e9d39501beb7088b3b491dc414fb0fcd7304e7173ff0868546
font_02_sfnt_off0000f262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 10324 bytes
SHA-256: 32ae65ea138b3124fbca257708feb7a6ff6fc58e2cb43c5bdd0d0f12c6afa889

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