Malicious PDF — malware analysis report

Static analysis result for SHA-256 87be2cf86289a08d…

MALICIOUS

PDF

72.7 KB Created: 2021-03-12 01:50:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eccbeee5ccd7f42dd64743e786521b68 SHA-1: 1b91ed5b5fcf1060c2e2ff7dc3b2c0a15d5b43be SHA-256: 87be2cf86289a08da72cfee8671dc95e5bc4a281f30e449878b112dba1c36e01
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links, 'https://botokaw.ru/strik?utm_term=how+to+apply+lubricant+to+elliptical', is flagged as suspicious. The ClamAV detection and ML classifier also indicate maliciousness, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the structure points towards a malicious document designed to redirect users.

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/strik?utm_term=how+to+apply+lubricant+to+elliptical
    • https://cdn.sqhk.co/zogobadakedu/egijhjg/30053920838.pdf
    • https://cdn.sqhk.co/fenazijeguk/iarhggh/17386639745.pdf
    • https://cdn.sqhk.co/vimerokil/yHShbdl/real_car_parking_games_3d_mod_apk.pdf
    • http://fodekofuxuvum.sportsontheweb.net/why_is_the_short_run_aggregate_demand_curve_is_upward_sloping.pdf
    • http://bovewitavivebu.getenjoyment.net/xuwawolewunumasu.pdf
    • http://lubevos.scienceontheweb.net/bronchiolite_cours.pdf
    • https://cdn.sqhk.co/sixepatexup/eghnSef/zonojisofap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5444299d-ec73-4319-97d8-cf4637956bd7/1374934680.pdf
    • https://s3.amazonaws.com/xeroguru/19277043173.pdf
    • https://uploads.strikinglycdn.com/files/ede43fc7-8a44-4ec8-9253-24e6ce40a289/how_to_stop_lg_direct_drive_washing_machine.pdf
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_c94bb17073744b7c8e84162641b3891d.pdf?index=true
    • https://s3.amazonaws.com/latufenaw/pefotan.pdf
    • https://s3.amazonaws.com/tugumeb/xidaganoposiv.pdf
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_0964863bc2e54df79fddc0c0e6c47441.pdf?index=true
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_79ca73c328ee4e279146beb110536b21.pdf?index=true
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_404198d579bc4cb8bae04a165c70bd38.pdf?index=true
    • https://s3.amazonaws.com/gagotaniwipure/oscar_et_la_dame_rose_zusammenfassung_kapitel_1_deutsch.pdf
    • https://uploads.strikinglycdn.com/files/1d0ab769-e16a-4af3-b251-d7eb27c3ccd3/schlage_commercial_keypad_lock_change_code.pdf
    • https://s3.amazonaws.com/vedexajawo/grand_reportage_famille_nombreuse_tf1.pdf
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_1290c76cda5444c19ba556952300d7a0.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_off0000e0ed.bin
acc04f31adaf08ba17ff8efd6021e964b45fe4973ba86ba0839558ab9548f41f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 5044 bytes
font_01_sfnt_off0000f239.bin
97260673b2e27626a739253a2be29a08b62db1c5820440bdd19598356f8bdd12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 10200 bytes

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