Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcdc883a37ac2df…

MALICIOUS

PDF

72.8 KB Created: 2021-03-07 15:55:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aa6f4d5e14256be921056a70fdd75043 SHA-1: 7e3377874c9fc585048e0f23443f73fd32b18ba6 SHA-256: afcdc883a37ac2dfa31c99c752999b8d3bbcd2b3744a25ad32e5507f1be5da07
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. This, combined with ML and ClamAV detections, strongly indicates malicious intent. The document body, though heavily obfuscated, appears to be a lure, and the embedded URL is the primary mechanism for delivering a secondary payload or leading the user to a phishing site. No scripts were extracted, but the presence of a malicious URL is sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/123?utm_term=imaginarium+mountain+rock+train+table+dimensions In PDF document text
    • http://fefiwizam.sportsontheweb.net/92081118267.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/nilaz.pdfIn PDF document text
    • https://kowedeta.weebly.com/uploads/1/3/0/7/130775164/5124275.pdfIn PDF document text
    • http://bibivire.mygamesonline.org/8717942407.pdfIn PDF document text
    • http://vomamafawib.scienceontheweb.net/how_to_adjust_thermostat_on_electric_water_heater.pdfIn PDF document text
    • http://vexetifiridik.mypressonline.com/video_production_business_plan.pdfIn PDF document text
    • https://dijemafewume.weebly.com/uploads/1/3/5/9/135992897/tolazuwezo.pdfIn PDF document text
    • http://zeruxejobimal.mywebcommunity.org/what_yoga_poses_are_good_for_lower_back_pain.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/square-d_40-60_water_pump_pressure_switch_9013fsg2.pdfIn PDF document text
    • https://nijumaweka.weebly.com/uploads/1/3/1/3/131379182/folubas.pdfIn PDF document text
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/f84ad19402.pdfIn PDF document text
    • http://ziximotizaned.medianewsonline.com/tanuzofabawojikuvifiw.pdfIn PDF document text
    • http://jirenaxapibetig.scienceontheweb.net/bazudateligatorit.pdfIn PDF document text
    • http://tikopariwoxa.mygamesonline.org/87533983425.pdfIn PDF document text
    • https://palivifu.weebly.com/uploads/1/3/3/9/133986562/riropasin_sovopojax_xasetog.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/35559868854.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/xupovobejanam/what_is_an_easy_keto_breakfast.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/it_asset_management_database_template.pdfIn PDF document text
    • http://naxefugoxodikow.atwebpages.com/what_is_the_history_of_everyday_life_on_earth.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/how_do_you_open_a_cannon_safe.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/gefagitegikivejumubuwawu.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_off0000dda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 5400 bytes
SHA-256: 3afc1aec245b66bc844214180982f7bfb298cb5b5ec1a049b19af964522daf73
font_01_sfnt_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 11056 bytes
SHA-256: 9ff0d4b056c02e8244e5b7a53c5ef627e670a19f6484bcfbda0f39ab193875fb

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