Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d86c08e7786caa…

MALICIOUS

PDF

81.6 KB Created: 2021-03-22 12:49:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cf8a3a47b8d06f049969b86c756ca04d SHA-1: 5704aefd9ec6b23744bb47dbe1bf343c430799a3 SHA-256: d6d86c08e7786caa1a72a637cf3e899ecc4770edb3be1c4b00d68a3eb3967811
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9393

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dugedepap.ru/award?keyword=como+superar+el+alcoholismo+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4493282/normal_5ffb58bed9aaf.pdfIn PDF document text
    • https://dezuximoloxesar.weebly.com/uploads/1/3/1/4/131410685/vigarod_xokepujek_tinureropagor.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/wekeloxiz.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/2578932.pdfIn PDF document text
    • http://teksalon.xyz/serta_motion_essentials_3_remote_sync626tc.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/7614887.pdfIn PDF document text
    • https://dafizigupiteg.weebly.com/uploads/1/3/4/4/134492389/bilifot.pdfIn PDF document text
    • https://tebojejuket.weebly.com/uploads/1/3/4/7/134764489/jopinosibu-texelotej-julaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374535/normal_5ff0e14c9da8c.pdfIn PDF document text
    • http://moscow-siberian-force.online/detofutanimipeduwabuduws8zx3.pdfIn PDF document text
    • http://insuranceautousa.com/vudugifujuxupatiziniubaia.pdfIn PDF document text
    • http://nuvifufaronez.22web.org/would_like_to_inform_you_all_that.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/c9qiijd/nulawidavejor.pdfIn PDF document text
    • https://gogabaxada.weebly.com/uploads/1/3/4/8/134852864/ec8946af6de3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476941/normal_604de2ea65786.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/hd3Kqjb/zepeto_blackpink_fansign_event.pdfIn PDF document text
    • http://nagajavanof.22web.org/spring_coloring_sheets_for_preschoolers.pdfIn PDF document text
    • http://bnl-jobs.com/epson_wp-4530_manualqdhiv.pdfIn PDF document text
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/2222f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuwixirad.epizy.com/cambridge_igcse_computer_science_textbook.pdfIn 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_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 5300 bytes
SHA-256: acf72fc49a7cac95d126dc0294cb06068287f2c73888e85bc81f3692d6614f94
font_01_sfnt_off00011a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A55 12252 bytes
SHA-256: 78341cdb92fb56d4026ed8b3b2bc4c7a48766b558663ec59f8a7482d8cc9beed

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