Malicious PDF — malware analysis report

Static analysis result for SHA-256 2394bfa92ceb1107…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 11:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4d1fb294066175c6d496e7792aa0df0 SHA-1: 60dd16984be3549dbae93572065134f25e251586 SHA-256: 2394bfa92ceb1107ff84d8fdbeec5845aaf0ef56dc9ac966a351cb37c797c336
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML detection strongly suggest an attempt to redirect the user to a malicious site, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://daiduongmetal.com/uploads/ckfinder/files/88706717800.pdf In PDF document text
    • https://mimpiindahsatu.com/contents/files/wosejulumamotetudu.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/95145290834.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/guvimubanilufi.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613f26bd9c7fc---sebuvodifuka.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/18312163312.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/gevamowusiwukoletafopeva.pdfIn PDF document text
    • http://annuaire-regional.com/ckfinder/userfiles/files/temokebopome.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/41295319400.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/rekilokagiwimodejoz.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109192243342246.pdfIn PDF document text
    • http://vce34.ru/attachments/file/mowimosazubojorimifa.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/12760457824.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/lekejevopezozulusafoz.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/11431875311.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/dejapalewojorakomapase.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/041327095684.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/28458131936.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/xizoferis.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/79537168581.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210903_EB1128842C81A68C.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/28623431133.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/87337623518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=horizon+minecraft+hacksPDF 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_off0000d554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 10696 bytes
SHA-256: 69a2f0f8a98e223fdfd07c6ce48f55b12b60759e7ac3c0ebfe3a8a39f3268a45
font_01_sfnt_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 17376 bytes
SHA-256: 553a6c0540f546c076d7f823a36a4755388126bd37627385a023c1fbd11e7c19
font_02_sfnt_off00011a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1