Malicious PDF — malware analysis report

Static analysis result for SHA-256 751ffe0cd7469731…

MALICIOUS

PDF

83.8 KB Created: 2021-10-05 09:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a2092d34748a4445246e635ea5a621f1 SHA-1: e72656096aad45bd1c5df59efd453c842c98e888 SHA-256: 751ffe0cd7469731826563b69cf64112fd9cf9be7d33d5a54d0f68fdcbac9f9d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the nature of the file suggests it was delivered as an attachment, aligning with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pnlestari.com/visitbali/image/files/zodazonururu.pdf In PDF document text
    • https://ksdc.in/userfiles/file/xivenupuredofopute.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/tamafipazedekamewi.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/bejale.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109280608134059.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/49561466547.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/33457427445.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/17530559565.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/6966801878.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/palimanabufusalikes.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a83ce71a38---43605326253.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16156792c08c84---4700490024.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/35705986025.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/kazulukotojemerixepir.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/xemajaf.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/53161683462.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/46102810566.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/12040042205.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/lexarejiwavisozesebef.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/76619491857.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/panomidalas.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/xasojixifetagebonet.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/gapipefenodina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=lesson+4.2+practice+b+algebra+1+answersPDF 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_off0000dd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7F 11048 bytes
SHA-256: 8220bd76f86cde443066330d41bab55ba0e6274edac29b141f70a9752561c960
font_01_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 19240 bytes
SHA-256: 448fd45ea53b0aa8a4c9551fa935a151cfd7e403396dd35401b58ecc51c5e706

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