Malicious PDF — malware analysis report

Static analysis result for SHA-256 139155756c3e5b88…

MALICIOUS

PDF

73.4 KB Created: 2021-09-17 21:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c258a24b835ecab97228c9e9ebdc089f SHA-1: 436787d3e0e526b5d55d3de7098f92cbfa0e1269 SHA-256: 139155756c3e5b88f1a976a6bf2a373424aef1da1db8b4c88310d1fa0064d7b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a pattern of using disposable hosting for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crysiq.ru/uplcv?utm_term=streaming+escape+plan+3 PDF link annotation
    • https://xnkvinatimex.com/uploads/files/tobodogoxotupi.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/vigadipefekomakinexiteb.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/zabilubazes.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/xuzufawimazi.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/gizesu.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/kopefek.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6abdb1d615b287fc7ceba03ac2c5fa4c/79148576854.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/94078083668.pdfIn PDF document text
    • http://mebco.ru/images/file/64300590898.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/12608986731.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/95824292529.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/bogidifoxaxopog.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/44318217699.pdfIn PDF document text
    • http://profstil.az/userfiles/file/bofozulonure.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/zudekopazutulusegagudax.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/bofaxiwivarusen.pdfIn PDF document text
    • http://lulanjina.net/upload/files/66330204406.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/lipomego.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/97958827272.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/ruratenetaduj.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_off0000b8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F6 17788 bytes
SHA-256: a10e5c2dedd493b476bd748a41db46fe8e55acbab9dc4c0e38d78a11e8377745
font_01_sfnt_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 10844 bytes
SHA-256: 95923b0b1018a7b48877a82af4fd639dc777ef08082e1fad71e0fb2b1339045b
font_02_sfnt_off00010097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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