Malicious PDF — malware analysis report

Static analysis result for SHA-256 6881fb782f8ce6a7…

MALICIOUS

PDF

92.0 KB Created: 2021-02-25 08:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2a079064f923d5e1f9deda0f8e8da73 SHA-1: 14b43c4403b8efe1a2e80176585f093815082904 SHA-256: 6881fb782f8ce6a72e9a3a3e5bad7c8358486547e82d3698d6b313d249a4b15d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a high ML classifier score indicating maliciousness. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malware distribution intent. The document body, though heavily obfuscated, contains keywords related to physics equations, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=thermal+physics+a+level+equations
    • http://sedopusomivul.22web.org/72891901515.pdf
    • http://loduwij.scienceontheweb.net/23005231930.pdf
    • http://kikababono.mywebcommunity.org/50037805858.pdf
    • https://static.s123-cdn-static.com/uploads/4477626/normal_5fe25ddf31ddb.pdf
    • http://zaxevef.getenjoyment.net/30034800154.pdf
    • http://navevukosuso.mypressonline.com/74636796328.pdf
    • https://cdn-cms.f-static.net/uploads/4421940/normal_60132b45ce116.pdf
    • https://cdn-cms.f-static.net/uploads/4372373/normal_601d5fc14e16a.pdf
    • https://cdn-cms.f-static.net/uploads/4369671/normal_602fe084a5de4.pdf
    • http://pitetivedu.iblogger.org/9602383697.pdf
    • http://mobufuwiwid.medianewsonline.com/tiny_homes_plans_canada.pdf
    • https://static.s123-cdn-static.com/uploads/4393898/normal_5fcb2c043421f.pdf
    • http://pugisapi.mypressonline.com/linear_algebra_4th_edition_friedberg_solution.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bolunivagoxel.epizy.com/xaguxunuzuku.pdf
    • https://s3.amazonaws.com/suxuzubojut/93024743892.pdf
    • http://liraperuwuw.atwebpages.com/relokufosozisetomorijuwa.pdf
    • https://s3.amazonaws.com/juvuraguvutoxif/tobime.pdf
    • http://wadoromutisagar.myartsonline.com/nordyne_gas_furnace_pilot_light.pdf
    • http://labofowidora.epizy.com/bachelor_point_natok_free.pdf
    • http://gewelokoroboru.rf.gd/8849562106.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f810.bin
40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF810 2900 bytes
font_01_sfnt_off00010254.bin
8c7e53463e92c379c08f7272231deb29099f4cc9926fccbe25e4cf02a82718a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10254 5292 bytes
font_02_sfnt_off00011434.bin
2253fb64547fcdc096fa7ac59a3736fc9405fa8da0db48a66bd7c0ffe8dcb204		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 11580 bytes
font_03_sfnt_off00013bf6.bin
dccbb3d97536817cc2d6232105853188764ca02f3cd0cbcfe1a75c1c27a81b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF6 16312 bytes
font_04_sfnt_off000151ad.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151AD 4324 bytes

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