Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eff61fdffbf9f64…

MALICIOUS

PDF

71.4 KB Created: 2021-05-30 18:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ef47d45feae1d984012432d7025f0190 SHA-1: bd9ff006d45e0743300f77d1ea7a8b27486b3c99 SHA-256: 7eff61fdffbf9f6470b082e1df20b48f7fcd3ad9b136b25ff57c98f91eb2afb4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on file-sharing services, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to drive traffic to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=pictograph+worksheets+pdf+grade+6 PDF link annotation
    • https://kewekekonuv.weebly.com/uploads/1/3/4/7/134732265/6749861.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/1c9d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_60203a1dea0f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485301/normal_6066424c9b296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405440/normal_606e7014b2bc7.pdfIn PDF document text
    • https://dofosigisez.weebly.com/uploads/1/3/4/5/134519942/4069900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489056/normal_6039768469370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418401/normal_6067d9e0d99a8.pdfIn PDF document text
    • https://wejafivikime.weebly.com/uploads/1/3/0/9/130969279/dd2864644459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_605cb5e994360.pdfIn PDF document text
    • https://jemidezegin.weebly.com/uploads/1/3/0/8/130874295/xatomoz_xunuritozasu_boteg.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/1b1093c2-fefe-465e-b2ce-153ae26b731b/netgear_wgr614v7_default_password_and_username.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/961ac773-e9c7-4a9c-8a28-56183bd3bc37/68312692385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65e3f303-d7e3-47a9-86bf-cf599d78cab9/spd_sx_editor_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f23b95f5-38d8-456d-ac81-123fbda620dd/jukidafazibizelawemor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a12cf06d-f7f7-4912-9380-b3f357508d3a/compare_amorphous_and_crystalline_solids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b01958-ec13-46ad-8064-296fcbcd09d7/scott_pilgrim_vs_the_world_game_pre_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb31d9b4-49a4-4ef4-80cd-1f50b927cce5/58640867992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d622782-2371-4c02-8e42-1e854fdada1a/nogemoguvasoxonize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7f22cd6-cbeb-4e8f-99ce-ad04cf0c3037/historia_de_mexico_libros_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a89530e-6295-488b-b640-c3ad577102fc/sedovikipukamupew.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_off0000d850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 5696 bytes
SHA-256: 17c0bf65922846db2db14c876387c3bd87c4ba63165bd3acc40b53a0264a355b
font_01_sfnt_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 10704 bytes
SHA-256: 670fbb0c9a2189f1270da693d5cb702d9647b3a60c9e8d8eca6a12ebe83627fb

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