Malicious PDF — malware analysis report

Static analysis result for SHA-256 84dddd2335bf0238…

MALICIOUS

PDF

75.4 KB Created: 2021-09-24 17:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f6eabe505588cc6e5835d639c2b91094 SHA-1: 201b7fdf0fec4686ea6f33dbff8b744211c447cb SHA-256: 84dddd2335bf0238e3a90eb06eb2b61d2976ee394d6e921c03fb085d1e6d5f2b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are associated with link farms and disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest maliciousness, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maribon.net/app/webroot/files/userfiles/files/giravidigalutujefolubi.pdf In PDF document text
    • https://bruceleevideos.org/images/file/beregunixapumexunojupate.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/dugemulaxekuros.pdfIn PDF document text
    • http://schokofontaene.de/idata/43024187546.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/vonujidorawisudupope.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/zejefokutawopovosuwixof.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/tb6p32t4nna9uhmnd42f5h18m6/zigutebibikevivezerur.pdfIn PDF document text
    • http://shopabrang.com/images/files/39598997923.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/sividafufuxosaxa.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/96750757616.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/xegesoboguvidinufazejoran.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/64271192159.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/57602644703.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/serufopipum.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/gogojivatoxomow.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/xaviruk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=toilet+ek+prem+katha+mp4+full+movie+free+download+480pPDF 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_off0000b773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB773 11308 bytes
SHA-256: 51db069c7be0f48b87d48e995fc67eb554ae0326eb73b7139c2c1bc0fd4ccba5
font_01_sfnt_off0000d1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E4 20868 bytes
SHA-256: 821e4b42e1e5d10701bd8f174bd1d8ac945d36775708e93a02c83057a1de05eb
font_02_sfnt_off00010855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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