Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f0cd65df9225b5…

MALICIOUS

PDF

74.4 KB Created: 2021-09-25 04:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 867999aac762499f81c646a25c4a8a47 SHA-1: 15cac709b38b8afc759150319de0784626d12506 SHA-256: 19f0cd65df9225b5e9fdd3354d2144e13fafb2a10b0a142cb8ca9cb7aab411e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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.
  • 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://queure.ru/uplcv?utm_term=best+face+screen+lock+app+for+android PDF link annotation
    • https://primer-spb.ru/files/files/19299234505.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/55754165211.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/13903885687.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/61585429477.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3e2ee99a6---tezori.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/37738112409.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/tabuwa.pdfIn PDF document text
    • http://chinalabware.es/d/files/99582366749.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/golitun.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/38945906210.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/filemarozid.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/82779456574.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/74551889465.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/1766281814.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/58711334366.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/19046481174.pdfIn PDF document text
    • https://basisangka.com/contents/files/xowereporubadazisukak.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///ditamamu.pdfIn PDF document text
    • https://limsurdua.com/contents/files/83688014853.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16132f010eba96---wadosotimopurunokosik.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/zabafuzatobokutar.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/22245159055.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_off0000ba0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0C 10756 bytes
SHA-256: f20d768660daf62daebd0597facab5a6282d44a43742a7f9f9cfa19a5fec4553
font_01_sfnt_off0000d2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 19252 bytes
SHA-256: b7cc0168bf652d91c6799c746a04a82f4aa93016eeac50f4a231472e5aa9f349

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