Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b95772846849f5…

MALICIOUS

PDF

79.9 KB Created: 2021-03-15 11:30:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 53870cc6f230bafd052d6c898a3c0a82 SHA-1: 9385afc27d2753d679f3240d1f12d230e6efc5f3 SHA-256: 62b95772846849f5829ca43ff513100ca68ff49806a24628dc62d4897398da87
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://maypoin.ru/strik?utm_term=g+shock+tough+solar+won%2527t+charge PDF link annotation
    • http://uorott.com/deixis_exercises_with_answersrency.pdfIn PDF document text
    • http://pedron.fun/7273393744lpyj.pdfIn PDF document text
    • http://bejonigu.22web.org/anatomy_and_physiology_of_small_intestine.pdfIn PDF document text
    • http://fakafegixir.iblogger.org/gerard_butler_movie.pdfIn PDF document text
    • http://greatholl.com/work_energy_and_power_review_package962sm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_01cf9de1361047078db3e2978f19fd8d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91854226-42c7-41d4-a792-dd579d559e8c/28294065588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6e33c4d-b453-4169-bbf0-f4b022f8bfc6/29648132144.pdfIn PDF document text
    • http://lazasubesuwup.epizy.com/29634117262.pdfIn PDF document text
    • http://gabazozota.epizy.com/why_is_planning_important_in_early_years.pdfIn PDF document text
    • http://tuguwobafadurot.rf.gd/dububokubexoru.pdfIn PDF document text
    • http://dakofuvijazeti.rf.gd/68881321009.pdfIn PDF document text
    • http://puxalalofevan.rf.gd/16661731734.pdfIn PDF document text
    • https://04c6d2be-b5ec-470f-8655-bdc68d6defec.filesusr.com/ugd/3bcfef_fd42cb60ed5d4991899096550845570b.pdf?index=trueIn PDF document text
    • http://mutunibe.rf.gd/sneakerdog_s_phases_of_mitosis_worksheet.pdfIn PDF document text
    • http://dinixebun.epizy.com/free_order_of_operations_worksheets_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f193c6c2-d001-4d2a-9e3c-763cc2bca8bc/how_many_red_aces_are_in_a_deck_of_cards.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_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 5284 bytes
SHA-256: 40a3489e2c79d1c43d3fce700f74f1c7cbd1d25d78dbd28f0955737cb176aeed
font_01_sfnt_off00010a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A04 11460 bytes
SHA-256: 3d214a873a92a15c4e05fad422e54a56e809c38f09a7f2871fca12fc35fd219d