Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd1de832cf94900…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 12:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a459dee5fbb48385fce308a7ad58be5 SHA-1: 56393d88b9d0024df7c9b0ef84681bb58dd99562 SHA-256: 6cd1de832cf949006ff35e457d63b3356d28060b4ade0dc33c0539f130d611e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to distribute links across many low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://movediary.com/userfiles/file/fepifofuvobenefodiv.pdf In PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/zarovepumekobo.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/zumodinixune.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/kipofijus.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7b1bf74f---21918154458.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/16233065505.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/xabipagudejabofebokagopo.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/27510752741.pdfIn PDF document text
    • http://thevale.us/userimages/7154481373.pdfIn PDF document text
    • http://rcot.by/pics/files/14738843682.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/fitimifunogezobamejunikod.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/97088919246.pdfIn PDF document text
    • http://mayjack.com/upload/files/xezurumiluvi.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/mujokexudemitidajodit.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/xagetetobodekabakefavi.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/60155892500.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/pugukizigotuzib.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/vuxivojupiluja.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/49293568531.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/ravodupopari.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/42861642551.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/448696e9e19d431d6ef16ae1560f7e04/46199633414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=free+coins+pokemon+go+hackPDF 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_off0000dab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 10748 bytes
SHA-256: f91070b1145552934f53343b1ea0d551d0f8e022bdc86d58ef1d19fe0898ab19
font_01_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 19236 bytes
SHA-256: f2cd891b922cd93ea61445417bbaff9c4bc1cf5e5b48f31ac786f4c16d955a9b
font_02_sfnt_off00012588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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