Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b131e33832290a…

MALICIOUS

PDF

79.8 KB Created: 2021-03-14 05:54:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b83b00387887038895784f7e05dd86ba SHA-1: 9e35756493967824050dcafca6ed9c97d912dfdf SHA-256: 32b131e33832290a0ab6c64e2b61d5069379893fe5f8911ee933bbaacfebf9a4
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a suspicious domain that is likely part of a phishing or content distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=references+page+format+apa
    • https://cdn.sqhk.co/podiwilur/iAJdNji/mogokasuzitojumekewekuv.pdf
    • https://cdn.sqhk.co/vawadawuleja/iifhhjj/wood_sofa_set_images_with_price.pdf
    • https://cdn.sqhk.co/fezusife/chijjj8/thrift_stores_brooklyn.pdf
    • https://cdn.sqhk.co/tubafejog/iajgGIF/mini_racing_adventure_mod_apk_latest_version.pdf
    • https://cdn.sqhk.co/lupekute/gexhagj/buy_general_ticket_online_irctc.pdf
    • https://cdn.sqhk.co/sejiragidu/ha5z0hb/small_woodshop_ideas_pinterest.pdf
    • https://cdn.sqhk.co/podiwilur/fjjxiim/xareve.pdf
    • https://cdn.sqhk.co/tudobele/gecsWhh/66116953096.pdf
    • https://cdn.sqhk.co/tovozovuzedu/ghihjgg/43894733.pdf
    • https://cdn.sqhk.co/xisiwuba/sEifgdR/40486197097.pdf
    • https://cdn.sqhk.co/lediname/RYXDCr6/dulapekoromolafisuv.pdf
    • https://cdn.sqhk.co/zulatobi/ijdlYYe/38119432259.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_05e7c6db14394423b46af55beec9f810.pdf?index=true
    • http://zafotuzovis.epizy.com/76060690572.pdf
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_a1cd163ed4354222869af7420a924a6f.pdf?index=true
    • http://nisinukodepafix.rf.gd/levi_jeans_uk_fit_guide.pdf
    • https://s3.amazonaws.com/risalenefazozo/fepepuzi.pdf
    • http://tegofiv.epizy.com/tabasukopakidef.pdf
    • https://s3.amazonaws.com/legobegutulo/kundli_software_in_marathi.pdf
    • http://rinexabe.rf.gd/46318084756.pdf
    • https://s3.amazonaws.com/wuxupewu/12311137228.pdf
    • https://s3.amazonaws.com/tutasujal/bootstrap_register_form_responsive.pdf
    • https://s3.amazonaws.com/zobuwubedak/best_battery_saver_app_for_android_marshmallow.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_off0000f809.bin
15aefa31f91be91d61b5b5e287bbe2c463bb5a4e75c68899c08d4244e98523f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 5312 bytes
font_01_sfnt_off00010a13.bin
2244ebaade608a8139b4624c548923723ed77603e45a8023cacfc76f929d005d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A13 11080 bytes

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