Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f9664f24fc1603…

MALICIOUS

PDF

83.3 KB Created: 2021-03-14 10:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e89dfa47b08cad173d847a977eefec51 SHA-1: a2867c150b26ff1999e482aca516092d2f6b6528 SHA-256: d2f9664f24fc16032fe81deed6ed9a10a2586305971f931239732625e042995a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of outbound links, and the ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a lure to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jacksth.ru/strik?utm_term=how+to+study+for+a+driver%2527s+permit+test PDF link annotation
    • http://nupifijaw.getenjoyment.net/bell_hooks_teaching_to_transgress_introduction_summary.pdfIn PDF document text
    • http://helpcontactform.com/honeyguide_bird_information_in_marathi5120t.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/60570258230.pdfIn PDF document text
    • http://lazirog.mywebcommunity.org/42748274356.pdfIn PDF document text
    • http://zisezamerares.mygamesonline.org/osteoporosis_tratamiento_natural.pdfIn PDF document text
    • http://sait-ok.ru/vurux59coy.pdfIn PDF document text
    • http://dom-bita.org/audit_engagement_risk_assessment_template7jz4u.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/lSUOZie/rebuilding_trust_in_a_relationship_worksheets.pdfIn PDF document text
    • http://idealslimitalia-official.site/53200063077sjwgz.pdfIn PDF document text
    • http://forkidsshop.online/the_zookeepers_wife_book_movie120us.pdfIn PDF document text
    • https://cdn.sqhk.co/dusujukakal/GUhiQuc/28794760029.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/aNhd8Dt/online_photo_editor_remove_background_objects.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/5cc5389e-3aba-4278-8682-5f6fc936dcfd/21000131751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/947d74cd-d4d0-46dc-8b8f-40d1b320ce4b/how_often_can_you_do_a_liver_gallbladder_flush.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7951e0bf-4982-4059-98fa-3f76cc88bb46/financial_peace_university_coordinator_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fed7176-4818-4d45-8be7-21cb4f9cd582/keguk.pdfIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_98009ec86b814074b5b6c6cd3f00a299.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f725ff7-04ce-4fd9-89fe-ffb47ebf2c71/70264413253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac717dc9-0eb4-4b09-a9a4-7f1cd582583d/army_cls_recertification_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/394b467b-0b4d-4cc2-89d2-ab41c4163c1e/67_lateral_thinking_puzzles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1514cf1b-4145-40ba-8527-8585ce886099/pewerusujewalimo.pdfIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_4472be901aa34d3cb5f61580352c9f66.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/876cb642-88b0-4658-992a-67b2261aafd6/shortcut_key_for_taking_screenshot_in_windows_7.pdfIn PDF document text
    • http://livirava.atwebpages.com/xisovopowedatet.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_off0000f865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF865 5180 bytes
SHA-256: 8531a82b6c42fcbc105a2ddfc0dda6413785573870d2065e148f3abc0b2449f7
font_01_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 11400 bytes
SHA-256: 3b43f3c4727efe0d803a43e7ba6aa39dae79faae43811638ad3d0b4635344613
font_02_sfnt_off0001310e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e