Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b415f5bb89e651…

MALICIOUS

PDF

143.0 KB Created: 2021-05-29 15:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ae951c9b1f55aa33f6feebfe8f745f88 SHA-1: d08a6d014bfee88143d666851b779fafd57ef3c6 SHA-256: b3b415f5bb89e6518db3f225c825cd1d5efe86855d743bb6d10fdea27f36f11a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a heuristic firing for a browser extension installation lure, indicating a social engineering attempt to trick the user into installing malicious software or providing credentials. The document also contains numerous external links, with one pointing to 'fokemale.ru', suggesting a phishing or malware distribution attempt. ClamAV detection further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://fokemale.ru/strik?utm_term=elements+of+electromagnetics+sadiku+4th+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486359/normal_604dcc46a14af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_604f840f1ee64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422897/normal_5ff6959e0593c.pdfIn PDF document text
    • https://xejoxobufedad.weebly.com/uploads/1/3/3/9/133997298/8087710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416502/normal_6019a404e19f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375196/normal_5fe547780d373.pdfIn PDF document text
    • https://lavidibiw.weebly.com/uploads/1/3/4/5/134582964/f2a3a5805ec.pdfIn PDF document text
    • https://vulalubog.weebly.com/uploads/1/3/4/8/134862436/7a7103b398f0cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e1474720-c2be-4744-91e7-cd3c8109ad0d/lewosikajumavetafipemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ba3747-411b-4034-882b-e5058f385d69/xuluvobeworaneb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c00294ee-858c-405a-b419-cd19a19b9328/75264371508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5450d5f7-edfa-4a90-b4b7-f8c8b0d4ed64/novela_doa_barbara_capitulo_109_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec7837c5-aeb4-4ed5-b3b0-1d8263626bed/will_try_my_best_to_come.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c56846-04b8-41e5-8425-7bb48f7b2d66/one_touch_ultra_test_strips_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685cc955-d429-41e6-b282-413d0a6fd70f/how_do_i_terminate_a_domestic_worker_in_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4bf3cd3-51f7-46b9-82e9-72c0f4883123/emotional_skills_regulation_activities_for_infants_and_toddlers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5825fcc-762f-4c00-820e-9127c1301673/woferos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99db601-230e-4fbb-90e9-74129e83614a/guitar_fretboard_notes_map_labels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16eecbc3-94be-47e6-a4d9-d8a46e5b88d5/bizesapepisugabawojugelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8353a965-5ced-429d-afe9-08c7dc060abd/physical_education_class_12_chapter_1_notes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E45F 5424 bytes
SHA-256: 566aa773a23bcf51d9d8aa008fc6beba39dd768d99ef4ed00a93e0d70e582b5a
font_01_sfnt_off0001f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6AD 12140 bytes
SHA-256: ed0b21c5b033005da4c2ead60bb8e522c0210fea5263f82f1c8dcf14fd4ec1f5
font_02_sfnt_off00021e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21E11 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71