Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ec837464a2e393…

MALICIOUS

PDF

74.7 KB Created: 2021-04-13 20:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d72413901cc72d80916f5fe616611183 SHA-1: 43a5572b18b1f0c77f38bc9102a075f571d44f64 SHA-256: 10ec837464a2e39358123e16c73c6974aeacad48ad799dfaaa3cb20f4f61d7c7
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bologen.ru/strik?utm_term=mechanical+engineering+degree+colleges+near+me PDF link annotation
    • http://xokezuwadem.mygamesonline.org/kizozofapob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374689/normal_5fca0bd077b3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409621/normal_5ff00087702f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481820/normal_5fcb348c92843.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_6010a6c56dba9.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxexaxi/hrBejjH/jibelapi.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/how_to_lie_with_statistics_summary.pdfIn PDF document text
    • https://jebezowurexa.weebly.com/uploads/1/3/4/5/134576847/zurajutosaxodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445106/normal_600f130533f5f.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/6b991d9023a4.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/9ggwicj/subakoxotiwedatojerul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_56ed094c8c774619986aba50c5bf68d0.pdf?index=trueIn PDF document text
    • http://feferabi.atwebpages.com/51592110566.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/air_force_1_white_and_black_junior.pdfIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_cfa52fd3ffac47deb68f84c9a81060c2.pdf?index=trueIn PDF document text
    • http://ruzakema.onlinewebshop.net/14708916696.pdfIn PDF document text
    • http://zeteximezoxa.myartsonline.com/oxigeno_y_radicales_libres.pdfIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_64228a601d2f465f904f039e655c23b2.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_off0000e63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63D 5356 bytes
SHA-256: 62b1c48b80febd6fb754689d19e29daec0742c87d3a96306832cd630e6e0bf97
font_01_sfnt_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 10860 bytes
SHA-256: e7be689f7f1ee8938c3f3887d62a7fd15578be7051c8d49995e7a47fd1d4d5f7

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