Malicious PDF — malware analysis report

Static analysis result for SHA-256 970eea54b5995aba…

MALICIOUS

PDF

75.6 KB Created: 2021-10-02 21:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 126ef58ef94a5c4af07877a62750e5f4 SHA-1: 40fb51873444afd3630ac0e1d1db1e31141744e0 SHA-256: 970eea54b5995aba572cb4dea779ee444a9a45e1267439e8fe7dd41a45d5f3ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The document contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded URLs strongly suggest a phishing or malware distribution vector.

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 http://gshosnab.ru/userfiles/file/32400692581.pdf In PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/39401029223.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/fumujalamelixitojerak.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/zixosaromoxirasokera.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/buramikakov.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/xamezosogowowukapaluk.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/gaxalotupupes.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/93459190585.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/togakonomuno.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/72041065708.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/xebejigixutule.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/10254020274.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/28606901301.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/65377799463.pdfIn PDF document text
    • http://enricobarraco.com/files/94358869965.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/setij.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/tupojorubof.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/45726646584.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/xegajan.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/30687377225.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/15473915551.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/84641796027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=see+you+again+charlie+puth+mp3PDF 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_off0000bb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB94 11112 bytes
SHA-256: 2cbc133d1811b78e4d4b6be4d8d86cf52cf962e0bd49a30328fe064b95127cee
font_01_sfnt_off0000d55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55C 19860 bytes
SHA-256: 605a9f85b4cb8df8526f74a41fa076ed7a834ed0ff1afd3676df2ae1797abea5
font_02_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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