Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f86cfaaeff06b43…

MALICIOUS

PDF

65.3 KB Created: 2020-11-23 16:01:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2736a5eebdb03c0f48fafc9ce2b2464f SHA-1: 1550925d825b97ee39a089080b5d581a7bf6f0b2 SHA-256: 8f86cfaaeff06b43871f5ea2911018c983d42e0501df025f61be9f8e9ee4533b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafftec.ru/strik?utm_term=advanced+dungeons+and+dragons+2nd+edition+pdf+downloads PDF link annotation
    • https://todurudivi.weebly.com/uploads/1/3/4/3/134344361/wagaxelixavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_5f9351324411b.pdfIn PDF document text
    • https://degepuwenezeg.weebly.com/uploads/1/3/1/6/131607310/b993279091b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380068/normal_5fb534ce0f786.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445340/normal_5fa3b35d0f4ed.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/8491700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368985/normal_5f8e27eebb790.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zakunafu/lidawidaziguregevonega.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/thundertree_map_roll20.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/zombie_cranberries_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/9938470704.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/american_revolution_map_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/86529956607.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC120 5596 bytes
SHA-256: 14b9bd755e691b49748465aed63d6ea6f2bd55411d2fbfd102b3f5624f280c89
font_01_sfnt_off0000d450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD450 10492 bytes
SHA-256: 6680f2ccdb635e3328fe617051412d22902fdecbe2abafbc7e68ea4da9afaafd