Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd898930f802515…

MALICIOUS

PDF

73.5 KB Created: 2021-03-06 21:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7d95f239f5f9ebab051a5f10dda78d4a SHA-1: c8f435eeb32f73bb1ba2eb73ead60eb1966d0056 SHA-256: 7fd898930f802515d80cb988c008aedcd04d7dfc569dd20335db4589e7dbefed
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and detected as malicious by ClamAV and an ML classifier. It contains numerous external links, including one to 'vilenefex.ru', suggesting it's designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, appears to be a lure related to educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://vilenefex.ru/wix?keyword=how+the+earth+was+made+iceland+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/vopofuxo/cjddjg9/descargar_no_crop_for_instagram_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/fGeiahi/38077783583.pdfIn PDF document text
    • http://modernstyle.pro/39840239514srf6j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421783/normal_6007af4e8b631.pdfIn PDF document text
    • https://cdn.sqhk.co/letabuner/iihasgj/97142996630.pdfIn PDF document text
    • https://cdn.sqhk.co/tatudawo/thhFrsi/fefobezituzimimodovob.pdfIn PDF document text
    • http://avit0.pro/double_gun_shoulder_holster_for_saleb5525.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/giChjAV/13809577186.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/JiajThi/mini_golf_near_me_indoor_mn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365562/normal_5ff22c5b28f26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476152/normal_5fe356df22461.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/jbie1kU/tafaboruvebiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418188/normal_601ee8de45f88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_dd7433aacac745f1a0d1b49fb9352176.pdf?index=trueIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_742f441d0e234c1ea452a7a788237d6e.pdf?index=trueIn PDF document text
    • http://galopaxuvubopuj.rf.gd/85145324598.pdfIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_d02a66547d1549be8763a8d26583199d.pdf?index=trueIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_6c3152eaf91f4045bae374d54efcd935.pdf?index=trueIn PDF document text
    • http://dibiremiva.rf.gd/fovubafuzuginusadosozige.pdfIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_2177d15225aa4659a83cd9eb5d041203.pdf?index=trueIn 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_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 5296 bytes
SHA-256: 260da6479d337e71909ad678ad482cdd0bf36b0b4d29523a9efb851f9b7967ce
font_01_sfnt_off0000f4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 10356 bytes
SHA-256: 13b40e07c9f920b53ac78222f22194354dc05b0e0c55d026faee33dceecf2a56

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