Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc70f231d5341a8e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 09:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7052fcb40ebbebfabfbbfaa89559082e SHA-1: 9fbe1b3886ba303cfc231f96edc5c87a987fb321 SHA-256: dc70f231d5341a8e0dd019d37008a8d0cd98c0167414183072dfa8a117690e9e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a tactic to manipulate search engine results or distribute further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://vietrocknet.org/app/webroot/img/files/bozozewilamuvezagulawevu.pdf In PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/lokedevegokunokuw.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/75647007999.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/kamot.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/v04s0p7cp0evt1nhpefec75aq6/29088671287.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/bavodesudaketima.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/68003600929.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/99111269846.pdfIn PDF document text
    • http://sfssolution.com/userfiles/file/sovelorifedelebeko.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/67925796583.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/milideronifo.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/mudazivalonapiworen.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/gejovet.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/74406698590.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8fe2abf6---4086201096.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/sekowekaxapowejupiluv.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/sumebanuge.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/vizetoleramorajujuzox.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/16329919489.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/22181316349.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/85855100999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=application+pour+adulte+androidPDF 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_off0000d31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 19192 bytes
SHA-256: 36c96d37341413975add2270e38b4824fc822e2efd5dc8c8d9077affa170fa22
font_02_sfnt_off00011b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7B 10420 bytes
SHA-256: e20f33534f3992f2df2eec3983a85bd3b21ca4c194a10e86b13e7fccd3ab0f07

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