Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f14fce6b84fabea…

MALICIOUS

PDF

72.9 KB Created: 2021-10-03 08:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b3c3eeee91121fd18a0d7f24f567e56 SHA-1: 56fa138b370428398be608c26755c26db9abaace SHA-256: 8f14fce6b84fabeab16ba911083ace486abc8265f67728b2f63e3e276cf57270
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of these links suggests an attempt to redirect users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and numerous external links are strong indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=how+to+make+pictures+in+one+pdf+file PDF link annotation
    • http://siltherm.com/ckfinder/userfiles/files/kurusufipas.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/99704778512.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/98260591749.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/2dd7be552574b49e4a89010825788f6b/depipovodin.pdfIn PDF document text
    • https://europartner2.pl/uploads/zigetuwixitilosuzidanakok.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/susatobubupelenopuputoju.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/geneta.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/xebojeki.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/77108899015.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/kovovoxigus.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/kutigojepozizesuwaxewotow.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/pokiminapomemesufatijalob.pdfIn PDF document text
    • https://autoskola-scp.com/files/61786969040.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/pewanubafivi.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/12235912380.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/29689301489.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/45908494495.pdfIn PDF document text
    • http://balalajka.nu/media/25253788691.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/47981277651.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/menawaribozopigivupewokom.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc40f827cc---91309492903.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/nexikoxuxamawigadunuk.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/99768794225.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/9120089377.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/46869300615.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_off0000b69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69A 11052 bytes
SHA-256: 216d9e3ea63a67dd8a1f24f148299740445c495ad011837c341c7b133be8e1d2
font_01_sfnt_off0000d04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 17612 bytes
SHA-256: b54dc2826e29af1915cda38efcf340020579835815cd90f5972a23dfba7519ad
font_02_sfnt_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1