Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fc66ae1ac8f971…

MALICIOUS

PDF

91.9 KB Created: 2021-03-28 14:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 300f0291ac549d64e4de0acae1729d9f SHA-1: 6d6f88d90574c9176a3fd3e53ae9e348827bcd4d SHA-256: b4fc66ae1ac8f971781b8f8b3a8ec33f8e81dc7d6e3ed3f5cf8a5b233cbca008
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially malicious or spammy hosting. The presence of embedded URLs suggests the document's primary purpose is to redirect users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://druttle.ru/award?keyword=asterix+comics+pdf+in+bengali PDF link annotation
    • http://zivemigidefis.mypressonline.com/88775602780.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/ms_project_online_mac_os.pdfIn PDF document text
    • http://legegapepapo.medianewsonline.com/elastic_beam_theory.pdfIn PDF document text
    • http://pugezesiw.mygamesonline.org/runir_plusieurs_en_un_seul_document.pdfIn PDF document text
    • https://xesusilinani.weebly.com/uploads/1/3/0/8/130874458/dixozi.pdfIn PDF document text
    • https://mukoxawav.weebly.com/uploads/1/3/4/6/134627731/7860036.pdfIn PDF document text
    • http://dusipoweg.mywebcommunity.org/88341417305.pdfIn PDF document text
    • https://jibigevemur.weebly.com/uploads/1/3/0/8/130873945/xujojedu_zopovud_kovuluvumadefis_tobaxubob.pdfIn PDF document text
    • https://jiwuzutobaduf.weebly.com/uploads/1/3/4/8/134889186/0c6f48ac874b16.pdfIn PDF document text
    • http://fesunasisodenod.getenjoyment.net/dell_latitude_e6510_audio_driver_windows_10.pdfIn PDF document text
    • http://wosutopanoba.mygamesonline.org/83752809197.pdfIn PDF document text
    • https://petavigavixate.weebly.com/uploads/1/3/4/4/134459614/a92395b5.pdfIn PDF document text
    • http://vovevowumusiki.iblogger.org/850749523.pdfIn PDF document text
    • http://piwifeg.22web.org/marketing_definition.pdfIn PDF document text
    • http://togaxifobuf.mypressonline.com/32618734271.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vudexejuvejutek.rf.gd/sherlock_holmes_bookshop_mystery.pdfIn PDF document text
    • http://zexorodepejaxew.rf.gd/don_quijote_cervantes_espanol.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/cambridge_first_certificate_handbook_with_answers.pdfIn PDF document text
    • http://jutivowewinuled.epizy.com/75518193478.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/12588044110.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/bioshock_infinite_weapon_upgrade_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/how_to_write_a_quote_in_apa_format.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/leominster_ma_police_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/lights_out_tour_group.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 5672 bytes
SHA-256: 874243d591c9081b3f48e76575de6e296ad02020fa549c1098b4de436782639e
font_01_sfnt_off00011195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11195 5776 bytes
SHA-256: 0ad51f5591ed10b56f49626d6a1f49594afdb352f4cfb24f37c5b89fe350ffe6
font_02_sfnt_off0001249f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249F 11400 bytes
SHA-256: 336609a1cbda6451fdd0b7bdabccc329552efd383cab91d4fcbb561c6118a243
font_03_sfnt_off00014b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B68 16264 bytes
SHA-256: 875232d66f0115683be5fd1ac03db91024a9b30b37cf620eb48ca25c42e0c616