Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfcaea71758024bc…

MALICIOUS

PDF

71.0 KB Created: 2021-04-10 00:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7238ea201b37981046a78d2f27ea86e6 SHA-1: 577af89df0a335bc9d555c3cdcafe8606326a842 SHA-256: cfcaea71758024bc8aba5f67cda6bb169f54fce508e7d4aff2f955e350238d39
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are associated with link farms, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to search queries, suggesting a lure to a malicious website.

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://mezovuduw.ru/strik?utm_term=is+there+a+keyboard+shortcut+for+strikethrough PDF link annotation
    • http://fosonelotila.medianewsonline.com/internet_advantages_and_disadvantages_points.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/BzDskhb/one_deck_dungeon_dlc_review.pdfIn PDF document text
    • https://cdn.sqhk.co/bawijodol/hdiSihi/zamakipasoveloneviwujefuf.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/hbigthf/human_resource_management_certificate_worth_it.pdfIn PDF document text
    • http://paxenazubenib.mygamesonline.org/dajoratunetovux.pdfIn PDF document text
    • http://gazozasi.scienceontheweb.net/xodewebojozomi.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/mclean_borderline_personality_disorder_screening.pdfIn PDF document text
    • http://xetudevera.22web.org/fovamu.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/Tiihage/crack_bones_therapy.pdfIn PDF document text
    • http://luxazeguliwa.iblogger.org/cartridges_of_the_world.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fopalew/perfect_english_grammar_tenses_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/kgf_chapter_1_movie_songs_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/adding_and_subtracting_directed_numbers_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4898346c-7657-4e52-a298-a8eaa5499253/tojumobitusujof.pdfIn PDF document text
    • http://nobuxuka.epizy.com/37476049776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f7e8a5-ab55-40a1-b315-458ca5604c09/nj_driver_license_knowledge_test_sample.pdfIn PDF document text
    • http://lojokedasu.rf.gd/army_apft_scorecard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd31dcdf-8aaf-4089-ad7b-35c6f7bdcb63/marshall_mcluhan_annie_hall.pdfIn PDF document text
    • http://zikajubagunefef.rf.gd/2008_toyota_camry_hybrid_battery_life.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_off0000d698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD698 5492 bytes
SHA-256: da59e81a478eda9129036246a02fbbf7a02e8ecb6db71e5f960a397cf94c1595
font_01_sfnt_off0000e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 11060 bytes
SHA-256: c3514be478bff9f5335c744a2305c3ad84aed0d0d48a74c6a24fecb5d40c7ee8

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