Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a134683c7e8c4b…

MALICIOUS

PDF

75.9 KB Created: 2021-03-22 06:24:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f8343f1e951109e56e0466b4aef8952 SHA-1: efbb5ec1a93dfdb2fc17f9e14fb8a91db2b01c05 SHA-256: 10a134683c7e8c4b7f17a9e126c2955e81e757a7fa41496bf244724172dcb458
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to distribute or phish via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=don%2527+t+doesn%2527+t+worksheet+pdf
    • https://kaxawoxo.weebly.com/uploads/1/3/1/0/131070710/xezevubobedinug.pdf
    • https://cdn.sqhk.co/wazafanez/Pjdii8r/rozodivisakab.pdf
    • https://cdn.sqhk.co/xugavizira/ifgBVfR/how_to_say_basketball_hoop_in_spanish.pdf
    • http://nawogevimogagu.22web.org/96776163335.pdf
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/7725edbc.pdf
    • https://cdn.sqhk.co/xerejijasoma/hjXYxji/bible_theology_books.pdf
    • https://bobusenig.weebly.com/uploads/1/3/4/8/134866704/rolipowebisuk-todowarirozam-niwefufapefifis.pdf
    • https://cdn.sqhk.co/vexavudakepa/iexjcR8/58879303080.pdf
    • https://cdn.sqhk.co/tibidimewako/h62IChd/acronis_true_image_2018_manuale_italiano.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_2b9bf90d0f564298a9d2cef762f758a3.pdf?index=true
    • https://s3.amazonaws.com/tawovojo/zapugapavoxefuresuv.pdf
    • http://zugugizifozuwor.epizy.com/sojopajawako.pdf
    • https://s3.amazonaws.com/tikoweravisixu/cours_anglais_et_franais.pdf
    • http://nalasorujuwasop.rf.gd/what_does_it_mean_when_service_engine_soon_flashes.pdf
    • https://s3.amazonaws.com/nokiva/casper_bed_reviews_consumer_reports.pdf
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_902724fe098640f9be79d2001dc03e9e.pdf?index=true
    • https://5de9ed01-d610-4143-94db-6f998645a8ce.filesusr.com/ugd/1d8bf6_c20516996e934202a86906dd413ceb9c.pdf?index=true
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_5bc14051543b4fe89da0e115099d0308.pdf?index=true
    • https://s3.amazonaws.com/sixolose/mhw_bow_progression_guide.pdf
    • http://gokobuvutojo.epizy.com/homonyms_and_homographs_worksheet_grade_3.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7e.bin
2022435eaa8cfc68ddd3787f63181bec2cb627a7863958782ce32e7a9869c20c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 5076 bytes
font_01_sfnt_off0000fee0.bin
629b52f6f2113793f8dab44c0a79e665bcd86b48d97d07ff6d38ef3fdfd45b2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 10492 bytes

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