Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4031f36b9e2577…

MALICIOUS

PDF

76.5 KB Created: 2021-04-04 04:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04bbd23fb606857863370482df12b06f SHA-1: eb2d7f8041426da0180ed0fd580c752c679ea7de SHA-256: bc4031f36b9e2577d7c78a079a0ac63449d6d264776f72d9d936f583d3784c95
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 domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://xezojetit.ru/award?keyword=aerospace+science+and+technology+pdf PDF link annotation
    • http://varnisvakq.ru/loanwords_in_english17ndp.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/is_tutuapp_safe_for_androidr5ajf.pdfIn PDF document text
    • http://techanomic.com/39805162855yteek.pdfIn PDF document text
    • http://quinzsy-studio.design/coping_cat_worksheetsjz29r.pdfIn PDF document text
    • http://servisvds.ru/foxufobeximugtlzh.pdfIn PDF document text
    • http://sweetmeet.online/scott_scale_710_size_charts03p0.pdfIn PDF document text
    • http://service-hire.com/ding_dong_merrily_on_high_sheet_music_piano357t4.pdfIn PDF document text
    • https://rinezafuwokof.weebly.com/uploads/1/3/1/4/131437641/zenen.pdfIn PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/2473746.pdfIn PDF document text
    • https://zarozeginete.weebly.com/uploads/1/3/4/7/134708045/8cbde0c6aa8e316.pdfIn PDF document text
    • http://ig-socialmedia.xyz/zovajuxeliramuvevos3vclo.pdfIn PDF document text
    • http://fuluwube.22web.org/billboard_mockup_psd_free.pdfIn PDF document text
    • http://icily.xyz/org_chart_template_free_excelatokj.pdfIn PDF document text
    • http://okstore.info/bonunegukekonilodenx5fl2.pdfIn PDF document text
    • http://techanomic.com/72260853906r19of.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://supikovibamukip.epizy.com/52982507181.pdfIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_81dfa84fd00a430d8d350d263ef073eb.pdf?index=trueIn PDF document text
    • https://87098103-4d08-48bb-90a6-807b0ef734b2.filesusr.com/ugd/1f49de_a675942bc9ea48e1b8105033d4de82d8.pdf?index=trueIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_3406657b1fcb41a1beca0a5263c6e99e.pdf?index=trueIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_d2912c327ac64d39a4cc37780db559cf.pdf?index=trueIn PDF document text
    • http://fizanotafogibag.rf.gd/dutozutolovaxekexojazeriv.pdfIn PDF document text
    • http://pojawibe.rf.gd/fowadeza.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_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 5508 bytes
SHA-256: 4bb5366914c2694a185fd334e71909bacfecc4962a4058f8e428107a0a91562b
font_01_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 10604 bytes
SHA-256: 99196981d957a8c8348f9bfef138866d3b443e8edd8db53e0889ed7c64ae9f7a

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