Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2aeed7321c4ce5f…

MALICIOUS

PDF

70.1 KB Created: 2021-02-11 15:50:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 29c4bd0d276a6663083978d528dc37a6 SHA-1: d0d0a3aa841f87611968c35762d7d32ff6c7c4f8 SHA-256: a2aeed7321c4ce5f715521740194722dcf970ec2a6267d55e0c0153ef1acf3e4
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, suggesting it is designed to redirect users to numerous other PDF documents. The embedded URL 'https://seumenha.ru/wix?keyword=world+history+chapter+10+test+answers' is presented as a lure for educational content, but leads to a collection of PDFs hosted on various domains, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

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://seumenha.ru/wix?keyword=world+history+chapter+10+test+answers PDF link annotation
    • https://medijoju.weebly.com/uploads/1/3/1/4/131452922/73b977f.pdfIn PDF document text
    • http://christmas-gift.ru/all_business_letter_formatny00m.pdfIn PDF document text
    • http://petersikdar.com/27301649756uxfmk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484818/normal_6019f3478051c.pdfIn PDF document text
    • http://womenita.fun/running_shoes_nike_zoomx9cfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408009/normal_6020270f9f9b8.pdfIn PDF document text
    • https://zelogevoge.weebly.com/uploads/1/3/1/4/131483318/14035494b691a.pdfIn PDF document text
    • http://vykupavto54.ru/tenses_passive_voice5a3ga.pdfIn PDF document text
    • http://duplicwcnj.space/pinball_space_cadet_download_macos8tw.pdfIn PDF document text
    • http://namelesssouth.xyz/compressor_isentropic_efficiency_equationq6fw8.pdfIn PDF document text
    • http://feelslike35.com/pigejelewigusimomulof0o2gu.pdfIn PDF document text
    • http://oneitstore.pro/divurozhbp3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387590/normal_5ff264575980a.pdfIn PDF document text
    • http://specialsale.info/fobedafinukurcp4j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/buddha_charitra.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/vatud.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/e_bicycle_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/vajewogodatimupajamewok.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/minil.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/nifubuvoravapudo.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_off0000d58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58A 5564 bytes
SHA-256: 1031faee91438c3d6095b2badd09e8ed5aeeb3ced49632f8146a76c0faa6cefc
font_01_sfnt_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 10160 bytes
SHA-256: 86305f9dbe855e444aed040b48614f496c6344a6d7db79a0c1c78089ce02ff14

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