Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf136f51e3d5b943…

MALICIOUS

PDF

69.1 KB Created: 2021-02-18 16:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0674630979aabaed708adcca83757506 SHA-1: 5e415be5f08bb8b4101d9d2f7555c816c54e8c36 SHA-256: cf136f51e3d5b943ff30639c93f431bb2927821f3da7a3c64d8d8518e327ca3e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://jacksth.ru/123?utm_term=klh+120+watt+powered+subwoofer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4493920/normal_5fcecd44db42e.pdfIn PDF document text
    • http://lidzadva.xyz/tv_guide_brisbane_fetchp6ioe.pdfIn PDF document text
    • http://sekasululaba.iblogger.org/crysis_1_game_for_pc_forestofgames._com.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421333/normal_600db23da36fe.pdfIn PDF document text
    • http://itsamorem.com/67036829812q8cly.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381543/normal_5fee0cb437a52.pdfIn PDF document text
    • http://fruitslope.online/ntfs_undelete_key_generatoroz9e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423171/normal_601861b953ad4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373241/normal_5feccee7b7156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488092/normal_602c3f3e51fd9.pdfIn PDF document text
    • http://moneymaya.site/autocad_2d_house_designewkx6.pdfIn PDF document text
    • http://about-central.com/minecraft_0.15.0_apk_download_freeugapf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462056/normal_600d66ed75c74.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/sugosubexez/brahma_movie_songs_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/93564703648.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/37949011749.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/76910638202.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_off0000cee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE0 5656 bytes
SHA-256: c6eb627e2fb4aaea843d7a1d408546e1b5888f96a15f3e4078f3f92406779b3f
font_01_sfnt_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 10924 bytes
SHA-256: a74c2c925ec66332bcf300d71f2c0670a68af9739306c3debd85589ca081680b

Open this report in the interactive analyzer, or submit your own file for analysis.