Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2479faa6ea4bf28…

MALICIOUS

PDF

67.9 KB Created: 2021-04-02 23:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f2a53aad08b0069b18eb052a2a88cae7 SHA-1: 540836f3f1c46705fc8eb436dba10e5a9bbe33d9 SHA-256: f2479faa6ea4bf286a3f527b062252125dd8f8b9613933bafb47e9529f976b89
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a large number of external links, suggesting it's part of a link farm designed to redirect users to potentially malicious sites. The embedded URLs, such as https://botokaw.ru/wix?keyword=acid+nomenclature+worksheet, are likely used to distribute further payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=acid+nomenclature+worksheet PDF link annotation
    • https://cdn.sqhk.co/nufopusifa/vEge2ib/chapters_interactive_stories_books.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_605d876ec5578.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/eC0T3Jm/24053935322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466153/normal_6044781febe1b.pdfIn PDF document text
    • https://cdn.sqhk.co/komajekolino/4kjigh1/84973567575.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/iRq3hfc/parent_plus_loan_interest_rate_covid.pdfIn PDF document text
    • https://cdn.sqhk.co/kavuzoda/anhh8th/sport_stickers_for_whatsapp_wastickerapps_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_605b096cc360d.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/uhaPgjX/fire_alarm_testing_report_format.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/NggduEd/which_phone_has_best_camera_iphone_or_samsung.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368756/normal_5ff8954094134.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/hdgdGpl/tuwapemuluf.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/4110b7b2-3e60-4c7f-8a39-2e331d5154f8/calories_in_chicken_taco_salad_without_shell.pdfIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_386aa7b7b4d4484b8310eb12c8d2c8d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1b291dc-aedd-421f-9c7d-2df3499aee69/hunter_xc_irrigation_controller_no_display.pdfIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_30ee80d7a3894fae8e2fb3cca32bef66.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce61af4f-1ef6-4b69-886d-d93f8e710799/cheat_codes_for_gta_5_for_ps3_money.pdfIn PDF document text
    • http://modufowiz.rf.gd/34788846487.pdfIn PDF document text
    • http://zudejemil.epizy.com/3759581713.pdfIn PDF document text
    • http://rujujarorimepa.rf.gd/todays_a_great_day_gif.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_27ed1dc9fe5a4cd7be9ffa90ddf56352.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3afeb217-806a-477e-85ea-a429cc72b20f/78845602626.pdfIn PDF document text
    • http://waleluxafifa.epizy.com/ielts_writing_marking_criteria.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_4f32e394908340e7a83682bfe37bd48f.pdf?index=trueIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_ab8e7f5b74ec42ac98c334c14fc2478d.pdf?index=trueIn 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_off0000cce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE3 5324 bytes
SHA-256: eb6a1058f72b87c7d39665df8d2c3d7eb66f238da2a00ab10b3c80dc6271c663
font_01_sfnt_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 10208 bytes
SHA-256: 440b2cbcb6bd2de4cd0978117c06c3eac3629f2dc6961c2d341d670223d4837c

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