Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54a3ea7dfe0bc5d…

MALICIOUS

PDF

73.4 KB Created: 2021-09-14 07:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1b16ef5bb2460cfd06c70f13706b2f90 SHA-1: 3c3124263bfff6c8d9a2a2886185855b5a827410 SHA-256: f54a3ea7dfe0bc5de8ecaeb8208dcdac00cc16375e02927f65c8db4b9d441651
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious content, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/fv83rsodju8npl5033qoi4lhp3/wativajopi.pdf In PDF document text
    • http://cl-metalparts.com/d/files/59704160891.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/rigonebuzilufumijelalivox.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/wakavijudizeka.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/38190458518.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/rajadizonowofixebim.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/72072823023.pdfIn PDF document text
    • http://www.pilartangguh.com/file/gupamuvudukowawuxu.pdfIn PDF document text
    • http://jiab.net/userData/board/file/24098503526.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/8025483768.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/tiwivavitamuvoguvutovomaw.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/tukoretinodarefew.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/pujilu.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/86108397822.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/28105012604.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/21105393998.pdfIn PDF document text
    • http://katachizu.com/img/news/files/donawokewuwutojaj.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/werifemikat.pdfIn PDF document text
    • https://dacola.com/upload/files/11820617964.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091121544932.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/zabuxojuzagoxi.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/wijapixemodanulisadabodub.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/67812661476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=electronic+workbench+for+androidPDF 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_off0000bb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB01 17192 bytes
SHA-256: 70fc9917ee77449df44b1f6db404a577213e15849bd198c9cb53c48d5863688b
font_01_sfnt_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 10708 bytes
SHA-256: ba91281c7917b1bbc52141e9ecec3f97882dcf225a8a115195b3dc97802a0578
font_02_sfnt_off00010014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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