Malicious PDF — malware analysis report

Static analysis result for SHA-256 6720f4e5286b2cd0…

MALICIOUS

PDF

65.0 KB Created: 2020-11-26 06:29:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 179599d9e6474d96e46a9279d2ff3a80 SHA-1: 9227f13adbd691a1492ac43d37ccb88e6158280c SHA-256: 6720f4e5286b2cd015f4aab4e2b20b6fc4c695a74eafe55d8961c0040bd622c4
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 0.9995

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://trafficel.ru/123?utm_term=fire+stick+4k+wont+connect+to+wifi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415756/normal_5f9dfb3fc9122.pdfIn PDF document text
    • https://porokademapu.weebly.com/uploads/1/3/4/9/134901730/kelan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392457/normal_5fbd80a7755b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8046256-a315-43dc-a21c-d306952d6671/pisoxobevikokebojejuvadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47f7449a-9501-47e5-8f40-b75516085179/givozuberikabenujozor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68b079e0-e758-4449-8705-b6ebb46868fc/kenshi_custom_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de47e73e-7f8a-4006-a5da-be02f65c6503/55472770751.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/xotonakezizagasikukux.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/vscode_auto_format_jsx.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/ppsspp_gold_apk_uptodown.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_off0000c475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC475 4832 bytes
SHA-256: 4c11de781a92224ea56f8f156f144c57a8f5df9ce270963ec7a7d960ff31a2d7
font_01_sfnt_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 10104 bytes
SHA-256: 767233400829b9963e113497b7750935a309bcce5bd5d3a4fa2b448160e98dbd