Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d278faf579ab5c8…

MALICIOUS

PDF

77.0 KB Created: 2021-03-28 05:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 604ff039951f252ae2cd140e346cca1a SHA-1: e005a32ee9a8a17c8687aa91e687e313304300ff SHA-256: 3d278faf579ab5c825a8b6d7265bce08d416159e1b7052f85b4255949c128e28
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 embedded external links, many pointing to potentially malicious domains, suggesting a link farm or phishing attempt. The presence of PDF_SEO_LINK_FARM heuristic indicates a mass of external links designed to manipulate search engine results or direct users to malicious content.

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://botokaw.ru/123?utm_term=chapter+3+ecosystem+ecology+answer+key
    • http://mokaxizekebade.scienceontheweb.net/jemovuzimipexabidowipapak.pdf
    • https://pekedepak.weebly.com/uploads/1/3/5/3/135399439/6634360.pdf
    • https://xasirazabad.weebly.com/uploads/1/3/4/6/134699738/firawame_wumepew_zafaforejenovar_vexaludu.pdf
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/gewidukarifubas.pdf
    • https://cdn.sqhk.co/pefisemise/iq90gcf/67647010143.pdf
    • https://filofasifujutoz.weebly.com/uploads/1/3/0/8/130874575/vewonu-buduxolov.pdf
    • https://xivanolub.weebly.com/uploads/1/3/1/3/131380121/fb5a11f57.pdf
    • http://jeseselanus.scienceontheweb.net/how_to_top_up_transmission_fluid_vt_commodore.pdf
    • https://cdn.sqhk.co/taxosavasesa/hhHgcgh/77360389364.pdf
    • http://kujamemapevubu.mypressonline.com/foxegajokumalakutirijuni.pdf
    • https://cdn.sqhk.co/satidaruxami/NCjbghO/51021607433.pdf
    • https://cdn.sqhk.co/wijugilom/jgOLih0/base64_image_to_php.pdf
    • https://cdn.sqhk.co/wokiwife/h3icMQc/ringtones_galaxy_s8_plus_android_10.pdf
    • https://cdn.sqhk.co/suxujaba/j5htjgj/geluw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/votawawo/hp_photosmart_c5280_all-in-one_driver.pdf
    • http://gozuketitara.onlinewebshop.net/72554437091.pdf
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_4153e784e20543d79074439c169f3508.pdf?index=true
    • https://s3.amazonaws.com/daraniwekamidir/kenmore_convection_oven_not_heating.pdf
    • http://lugenizuridaj.atwebpages.com/pet_sematary_original_cast_gage.pdf
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_6b330d7f1b12496a90095c56d828e373.pdf?index=true
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_3077fa463a59402d80d5775012658d9b.pdf?index=true
    • 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_off0000ec66.bin
e4b03ed8cf6376df7e2219b9a4b890eeb6109aa08aaf00e45732fd4c1b561f0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 5676 bytes
font_01_sfnt_off0000ffa0.bin
b318ffdfea97c43db5f0bfa5d6592de1f91a6ae52925c8785a63e709f23ab536		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 11128 bytes

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