Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2e69362efa1d8b…

MALICIOUS

PDF

71.8 KB Created: 2021-03-07 11:04:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8064bdaa54e733c71fa37b6f14c26d4d SHA-1: b4a2f4dc1bc42547a072d8df3bae69f806b9cfe0 SHA-256: 9a2e69362efa1d8b9962e5ba2926c252c9c302a2ff4f4baa36a36879f0976235
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One prominent URL, 'https://resalured.ru/123?utm_term=4+pics+1+word+level+2146+answer', suggests a lure related to a popular word game. The presence of multiple PDF links and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to potentially harmful websites or to generate traffic for ad revenue.

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-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://resalured.ru/123?utm_term=4+pics+1+word+level+2146+answer
    • http://tomolijoponix.mypressonline.com/bidilirikaf.pdf
    • http://mumolazesinidix.getenjoyment.net/destiny_2_the_last_wish_raid_armor.pdf
    • http://ravasixojodari.mygamesonline.org/rawukalazanunavate.pdf
    • http://tigafik.mygamesonline.org/windows_server_2012_r2_datacenter_vs_standard.pdf
    • http://puveputado.sportsontheweb.net/bq-cc_17_sba3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xuvekixofeku.onlinewebshop.net/basoxadafo.pdf
    • https://s3.amazonaws.com/wujodibu/amlodipine_besylate_davis_drug_guide.pdf
    • http://laniferes.epizy.com/see_below_the_information_requested.pdf
    • http://zikoliduxa.atwebpages.com/judetiwagizomiw.pdf
    • http://rerivumisiso.rf.gd/eternal_city_hiro_route_guide.pdf
    • https://s3.amazonaws.com/wukara/beginner_english_speaking.pdf
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_f76b6fa9fee44f0c8d668791ddffe30c.pdf?index=true
    • http://lakasixes.rf.gd/87386519455.pdf
    • https://s3.amazonaws.com/pizexopenaxu/computer_background_photo_free.pdf
    • http://wadexabosuzim.epizy.com/biblia_hebreo_espaol_descargar_gratis.pdf
    • https://s3.amazonaws.com/gidibesuxi/declaration_of_conformity_template_plastic.pdf
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_b03cf10af3a3483a9f61ff93fb4f784e.pdf?index=true
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_698a0cf7df8942679078ae12252e5dad.pdf?index=true
    • https://s3.amazonaws.com/tabobujimo/steelhead_fishing_report_orofino_idaho.pdf
    • https://s3.amazonaws.com/xovajukoxin/il_mulino_di_amleto.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_off0000db1d.bin
5376ecdaafa4c18f8b2b3e424e829a0f5d8070cc69f836e3901b22ff0f2dfa10
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1D 5552 bytes
font_01_sfnt_off0000ee2b.bin
06211006eb0bbc4c67584f37af33948a427d28fab6a232914151470739b2165e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 10508 bytes