Malicious PDF — malware analysis report

Static analysis result for SHA-256 177c214d81b1a906…

MALICIOUS

PDF

65.8 KB Created: 2020-11-25 19:04:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 98039666969d63ed16fc61f13bd5fc5a SHA-1: 595c19a58a1e9599795725596cda80e2451895f4 SHA-256: 177c214d81b1a906ef5899256f70aea36964e11d96254c155d4a04cfeb0a94bb
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://trafftec.ru/aws?utm_term=progress+report+card+comments+for+kindergarten PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381551/normal_5f8c030fab848.pdfIn PDF document text
    • https://totelulipax.weebly.com/uploads/1/3/4/4/134469391/felogalota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404966/normal_5f9ac8a76bba0.pdfIn PDF document text
    • https://bivovipolever.weebly.com/uploads/1/3/4/3/134347360/0d9e1a16.pdfIn PDF document text
    • https://zenefuzivoxog.weebly.com/uploads/1/3/4/1/134108933/xisomorixupudex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f9a96092d1a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380539/normal_5fa64b44d7658.pdfIn PDF document text
    • https://sonufutulopo.weebly.com/uploads/1/3/4/8/134864010/8256214.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/b21bdd4e-24d1-4c84-af2d-4008ff2f567c/nds_roms_mario_kart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/316764b7-18c2-481b-8d85-6660249451a5/67167834694.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_off0000c55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55A 5508 bytes
SHA-256: d0685d464cbe9481e9d4fd1926abc0a977d25b19082a4fb622baabc66cc561a9
font_01_sfnt_off0000d806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD806 10084 bytes
SHA-256: dbb125bfa89e9653f140e2688ad5582a040eb3de57d8e051e9aa8a9f4e9cd921