Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd336de546f34a01…

MALICIOUS

PDF

72.9 KB Created: 2021-09-24 02:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 10c3cf3aa837ed99bde748a45b3e85a5 SHA-1: e7a3bde2a28aa79c1d7a5cc7e8b2ee1c4193ce03 SHA-256: dd336de546f34a0145f2d6eb3fcf3247e223f760041c74bdc1b0e51a7e2416f7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to unknown or suspicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of hosting many links on disposable domains, suggesting a malicious intent to obscure the true destination or distribute various malicious files. The ML classifier and ClamAV detection strongly indicate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sangjeom.com/userfiles/file///80762295566.pdf In PDF document text
    • http://doudou.tw/userfiles/files/54103247517.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/36595680855.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/pudozosage.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/fewuxunot.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/zivikigosopazonamazog.pdfIn PDF document text
    • http://tradotel-riviera.com/file/fuzesepijovu.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/mezubarepaseg.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/61515704116.pdfIn PDF document text
    • http://synphabase.ch/upload/file/31864542239.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/dutufeso.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/85172153435.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/99908767671.pdfIn PDF document text
    • http://yongqingtech.com/d/files/90010518957.pdfIn PDF document text
    • http://herve-coiffure.ci/files/90136064243.pdfIn PDF document text
    • http://gangnampools.com/contents/files/jobekoxujewasatelupur.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/17324534626.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/vebizor.pdfIn PDF document text
    • http://cbstav.cz/file/tonoxubuponetakulifu.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/fajemogumeremanutol.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/pewuvapem.pdfIn PDF document text
    • https://trainova.com/userfiles/file/figabimiditowabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=conjuring+3+tamilyogiPDF 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_off0000bb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB37 10700 bytes
SHA-256: 3b245565ebbab0d330080cccdb46882766c9d41e468fbac5573089839dea9bb8
font_01_sfnt_off0000d3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 16368 bytes
SHA-256: dfc8a74e817d82100b6db0bbf6c0224e9836f77817ef6c8cd16a64de2c342a06

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