Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df743a77d9fbf2f…

MALICIOUS

PDF

79.5 KB Created: 2021-03-27 18:08:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 91606d18e6fcddc4c2f758fc0288973a SHA-1: bb48faef06c39af78bb3be36952d453cb8752d18 SHA-256: 5df743a77d9fbf2f026aaf6adb9d44e5a9dc3892db93c68e547f916916d524cd
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The embedded URLs, such as 'https://dugedepap.ru/123?utm_term=bulletstorm+pc+free', are likely part of the phishing campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/123?utm_term=bulletstorm+pc+free PDF link annotation
    • http://bcpzonasegura10beta-viabcp.com/english_test_a1_a2ka2l8.pdfIn PDF document text
    • http://mazafaka69pussy.online/who_is_the_person_of_the_year_2020_time_magazineehau3.pdfIn PDF document text
    • http://allroadkamchatka.ru/9042537906932tf9.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/2828b939-ce91-4b33-b3be-ad00beae4253/tovakuxalozutemetunul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37330a06-298c-4dde-a8b5-58de005ebbc3/senior_interior_designer_jobs_los_angeles.pdfIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_6c74b1bd4301452988d7830b9fb4f28e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a74bba-68ed-4f20-8e5d-b4436fd1ae1f/31670407837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbedd410-274e-4a23-bf55-ccf1e518ba08/subadunogili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a30e150c-c7f3-4fb5-93c1-bb363b1b4a1b/best_quotes_from_thinking_fast_and_slow.pdfIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_fbcbc58e02d2408ea35c65c0d69675d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/db1a36bd-30a3-4e21-b906-f273c7269c70/samsung_55_inch_tv_specifications.pdfIn PDF document text
    • https://c5c1e25b-3ca9-4f8f-aecb-0ee3b29cb37b.filesusr.com/ugd/f4fe7b_1d0e94adfa8c4c27b7926c1c89fc57bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/567e35dd-f73e-459b-87d0-888451d043e0/walmart_pharmacy_covid_vaccine_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c521f2a0-d111-4144-ad97-e0b9205cb67a/el_conde_lucanor_vicens_vives_clasicos_adaptados.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a9b0e59-1d5b-4ef3-ada9-5680d2108e8f/retima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/867d092a-3414-4e0a-96bb-d3627b9c4f26/dewalt_dw718_miter_saw_stand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9a5dad-d083-410b-a92a-e725a6b542d2/questions_to_ask_hr_recruiter_phone_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0c83615-9e99-45f7-b423-3f62ac636e43/jananir.pdfIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_c31b5b4bf47e4f2ba7cb2a3bf0317ebe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64013840-8d1d-4556-a953-e6a364b56d40/18626857615.pdfIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_c1350b05e4ad46cfaa93e8676d842d6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd5a78e9-e4a3-41a6-8ff0-f380ddf03971/33238916424.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_off0000ea37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 4728 bytes
SHA-256: ecf1c2d86876d5d4c1d8407a45be05af86d131420e155a95a1a10e880655e3da
font_01_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 11348 bytes
SHA-256: a70067ad176f622f968e768a46ba332aba5edafb61cf8eac216e0fc5ad265ef6
font_02_sfnt_off00012112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12112 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3