Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ce6c9cc25af0f8…

MALICIOUS

PDF

92.6 KB Created: 2021-04-21 03:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 950f6a695d063dad4b01dbe5704818a4 SHA-1: 9c7ae3b4214cf6c4393b0183041b511b0178c432 SHA-256: 91ce6c9cc25af0f8d80b8d178cb29a440c3fd2f5f4ae0e8c14d5f42081ec39e9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/strik?utm_term=what+does+mowgli+mean+in+indian PDF link annotation
    • http://jetinaxisodew.mypressonline.com/65229483734.pdfIn PDF document text
    • https://cdn.sqhk.co/pofifarim/jAOHd18/hotstar_app_latest_version_7._0._2.pdfIn PDF document text
    • https://viwoxinuzozaxa.weebly.com/uploads/1/3/1/6/131636825/rexojapivese.pdfIn PDF document text
    • https://cdn.sqhk.co/judawube/f9jdjga/walktrhrough_toca_hair_salon_4_updates.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/cOid8hc/lilliput_day_nursery_hersham_ofsted_report.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/1352971.pdfIn PDF document text
    • https://libosimi.weebly.com/uploads/1/3/4/0/134000241/vimavuwapolaka.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/d_d_5e_baldur_s_gate_descent_into_avernus_download.pdfIn PDF document text
    • https://cdn.sqhk.co/badalozebale/ibogeYv/rivuseterinekusuga.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/duiiiq2/50391482937.pdfIn PDF document text
    • https://viledilexemapol.weebly.com/uploads/1/3/4/6/134698440/lifexifebedibux_gagosasez_revavi.pdfIn PDF document text
    • https://guxatizozekeme.weebly.com/uploads/1/3/4/7/134733227/wigulelimofe-vevip-tanujopolivef-petus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/33ed8ef4-078f-4a8f-91b1-b39ce92833e8/line6_helix_hx_effects_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1481b2e5-7cad-407b-b33e-acee4a103bbb/how_do_i_find_my_navy_records.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c23ecd47-9609-4283-bd9f-4485ec34e735/wadezuruleraw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/919a0d20-9625-41b7-a73d-eeabf05dfb19/how_to_evaluate_information_retrieval_systems.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/personal_computer_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd87e66-c8ec-44ec-9707-e533a59927d6/36932494134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9697c69e-c64f-44d9-81c5-10900dc48308/how_to_use_a_krups_savoy_coffee_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/capitalization_worksheet_for_third_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd906a9a-f503-4c3b-a8dc-8479633a7089/18216429888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1529fee5-bde1-475d-adea-c28e1ccc3521/gevilesotuzovujasazo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001169e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169E 5248 bytes
SHA-256: 9af4996edfb48b8ebb736c893fec19d96869e4dc353c090281e6f53d454d8679
font_01_sfnt_off0001286e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286E 11636 bytes
SHA-256: fa209659d14d42fa981c93cf9e6b007710bc0fa3826ab9089c16b13e252e61eb
font_02_sfnt_off00014f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F99 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15