Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6c3512b1bb697f…

MALICIOUS

PDF

74.5 KB Created: 2021-03-09 00:18:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 25d5bcf74bf94e4ea898083fad9e1868 SHA-1: affe22c8cdd480367383b517137a0befcbcf5894 SHA-256: 8a6c3512b1bb697f5f49c24f95a73a66414fa898a2c3fd75826b37cf34a67bdd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious or spammy content, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://golowaki.ru/wix?keyword=how+plates+create+worksheet PDF link annotation
    • http://vijexibat.mywebcommunity.org/pivolise.pdfIn PDF document text
    • http://polfact.site/531708814740rw1s.pdfIn PDF document text
    • http://voicebftyi.com/how_to_draw_an_isosceles_right_triangle_with_a_compassw51kn.pdfIn PDF document text
    • http://scarcebook.com/translator_app_camera_androidxovdq.pdfIn PDF document text
    • https://fepunasavejupab.weebly.com/uploads/1/3/1/3/131381111/9746636.pdfIn PDF document text
    • https://faperusa.weebly.com/uploads/1/3/1/4/131454178/susaler.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/que_es_la_educacion_popular_en_trabajo_social.pdfIn PDF document text
    • http://chaptejvxz.fun/fiwimeferabesuwagime3ntqp.pdfIn PDF document text
    • https://vilamewu.weebly.com/uploads/1/3/0/7/130775649/rukivaxirur.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/juduk/dijevofenovid.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/51735725457.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/30906767131.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/melhor_editor_video_android_2019.pdfIn PDF document text
    • http://goruwon.epizy.com/lumufojajonuxinaxesek.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/flame_retardant_sheet_material.pdfIn PDF document text
    • http://nejarisiwudu.atwebpages.com/lane_recliner_replacement_springs.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/tajifamumaw.pdfIn PDF document text
    • http://gosewobagoxubok.rf.gd/steps_in_performance_appraisal_interview.pdfIn PDF document text
    • http://zorubanalu.epizy.com/31863238351.pdfIn PDF document text
    • http://timerojulawu.myartsonline.com/voropupapefolaji.pdfIn PDF document text
    • http://petikagemejol.rf.gd/jujogasofepatuwab.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/ginuwalotivufopesapulow.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/stardew_valley_fish_bundles_guide.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_off0000e81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 5136 bytes
SHA-256: 85fdbeb932fee48f2a8afc2350fb21370d19fbe23fd8b8f29a98ecd1ba3beaf3
font_01_sfnt_off0000f99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99E 10156 bytes
SHA-256: bc02cceb7f63d189c73fe2b60c177ff5ed9c7005be297c1d851917ce3e8f3df1

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