Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42e40dbf55375fe…

MALICIOUS

PDF

79.6 KB Created: 2021-04-09 08:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0580e40c991660435c5e1f606bb9fe31 SHA-1: da3d83ac48f5f5950408da56b0c361aa5884f5bf SHA-256: b42e40dbf55375fea3c270cd8c6ba42693a781c8d2ef3ba424478cb6973f06af
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=bluedio+turbine+hurricane+ht+bluetooth+5.0+wireless+stereo+headphones+headset PDF link annotation
    • http://urologo.store/how_to_treat_a_hypo_in_diabetes9krfj.pdfIn PDF document text
    • https://pesefusuf.weebly.com/uploads/1/3/4/4/134486856/sarimu_xakonijalisa_xenoxoselul.pdfIn PDF document text
    • https://tapulebuzaxu.weebly.com/uploads/1/3/0/8/130814605/8000622.pdfIn PDF document text
    • https://giximelet.weebly.com/uploads/1/3/4/2/134234701/5467995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_6055c50866d22.pdfIn PDF document text
    • http://bupro.asia/whats_the_most_accurate_pedometer_app6ae8y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389804/normal_5ff112363c56b.pdfIn PDF document text
    • http://janafan.scienceontheweb.net/25531945740.pdfIn PDF document text
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/6648896.pdfIn PDF document text
    • http://rixujewo.getenjoyment.net/pajawu.pdfIn PDF document text
    • http://zusiwibewire.mypressonline.com/22049112863.pdfIn PDF document text
    • https://xevupuwikuguv.weebly.com/uploads/1/3/0/8/130814145/c332f306f7e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/61757454645.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/place_value_worksheets_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/47963829538.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/gunoduruvaralodefobavaxe.pdfIn PDF document text
    • http://buzumigasox.myartsonline.com/jelutaboteju.pdfIn PDF document text
    • http://seretavezoduriz.onlinewebshop.net/besenos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 5624 bytes
SHA-256: 676b63ec8f65bb4efd66d61c787b5eaaffa2798be316e88026bec9321ba05406
font_01_sfnt_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 10280 bytes
SHA-256: c155fcc458474fb239fed8998f6b98b6b3bdcac617c81d898a66232abb7db3c4
font_02_sfnt_off00012249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12249 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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