Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d729d876dca10c…

MALICIOUS

PDF

79.7 KB Created: 2021-03-16 04:56:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4b48a2c687d7740a17ef16a070c1112c SHA-1: f5c8cd2ab09cb7266d6df646e8356781fb97cef6 SHA-256: d3d729d876dca10c43d15a0681abb04db18529624db5b447a411347c957630cb
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external URIs, with one prominent URL pointing to a site that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to a 'National certified phlebotomy technician exam study guide', suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://lozipotod.ru/123?utm_term=national+certified+phlebotomy+technician+exam+study+guide PDF link annotation
    • http://pinegobojefo.getenjoyment.net/20432957342.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/30548313786.pdfIn PDF document text
    • http://kifisafobubupo.mygamesonline.org/vexane.pdfIn PDF document text
    • http://reform-st.ru/19162827092yifkc.pdfIn PDF document text
    • http://xtreme-sport.ru/jiximorozigafofafmzde.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tukudapig.epizy.com/building_construction_book_rangwala_free.pdfIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_2e2753b203af4392bec85d74bf88ab78.pdf?index=trueIn PDF document text
    • http://zevuketeno.rf.gd/zurugopesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a074232d-4c29-4c6b-b4f9-ced2947736c8/call_me_by_your_name_script_to_screen.pdfIn PDF document text
    • http://zukalovuno.rf.gd/94551746023.pdfIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_ec5cfa18481741649e2c391267020894.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9117506-4fa7-49e8-b30f-b1ca970fee81/what_are_the_theories_of_punishment_and_explain_the_reformative_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8a4db1-e8e6-4ae9-a520-85b4db4352d5/foritajiketomi.pdfIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_9c9734259653435682c287e713540513.pdf?index=trueIn PDF document text
    • http://romakilax.myartsonline.com/capuana_profumo.pdfIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_e34da52d19514e6696d132a7489aa459.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d703e05-7d5f-4669-a301-2b04fc5ab207/i_am_enough_grace_byers_free_download.pdfIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_9095fe518cd54aba9464cd9e6e056554.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/greenworks_1700_psi_1.4_gpm_electric_pressure_washer_replacement_hose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9afe1b67-f797-4520-b4a2-84c91b2ac4de/what_reading_level_is_outlander.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/best_reiki_practitioners_near_me.pdfIn PDF document text
    • http://girifej.epizy.com/7th_grade_math_textbook.pdfIn PDF document text
    • http://wirileso.epizy.com/83859197029.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DB 5848 bytes
SHA-256: 7c31c06f42ac9104a862b8ef5f6069f80539bd0fd9a96b52883e8827c686fca6
font_01_sfnt_off00010bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAE 10980 bytes
SHA-256: ad5da8e282e175c79b14f7132aac5b70516eec2b67aa00056bb9b75b39ff6ef0