Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8dbc0206c593f2…

MALICIOUS

PDF

90.5 KB Created: 2021-10-16 04:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1d1bada46f954a317b553d4fb3c681ea SHA-1: 8a68ab688097f45adb120580f35bcf789a2be4af SHA-256: dd8dbc0206c593f2c1bbadaa6e73edcff1f1571f3c92d6f87ff5c8e6d31e0d21
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and external URIs. The PDF structure suggests it's designed as a link farm, with numerous links pointing to potentially malicious or phishing sites. The presence of embedded JavaScript further supports its malicious intent, likely to facilitate further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://siciny.pl/userfiles/file/72108373444.pdf In PDF document text
    • http://flexa.cz/docs/file/zinulufalijat.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/52522494565.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/nezepadovupunepo.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/pikofilamilogi.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/vixaxavorunubered.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/91102663887.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109080436554975.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/fafoxekakarawevaxunopaz.pdfIn PDF document text
    • http://saint-party.com/media/file/6460553571.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/43996972745.pdfIn PDF document text
    • http://masaze-bohunice.cz/images/texts/file/79367678636.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/67847773046.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48e6cc869---18386624796.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/jopolonusili.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/96386975826.pdfIn PDF document text
    • http://www.bash.cl/media/file/85796498721.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/pixasefegenipo.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/nubewanofi.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210920201202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/EqozwcbAC44/uplcv?utm_term=kevin+durant+hall+of+famePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/6771326460.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_off0000fc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 18284 bytes
SHA-256: d2c4c29d2a992a33ab5bbb0bfd3896242aa79fbdbe9262aac4326e13a1310bdc
font_01_sfnt_off00012c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C51 10608 bytes
SHA-256: 7de1561554c99bf7ca80a5af8cf01518405ff55286d5fbe0a4926a6510c63be8
font_02_sfnt_off00014454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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