Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de1a55a844c2c0a…

MALICIOUS

PDF

74.7 KB Created: 2021-06-07 16:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4a9946a9c31d78c77028d021b77eeaf2 SHA-1: aa2b655843120bcd24ae42be6eefa25c6cd6a160 SHA-256: 3de1a55a844c2c0af63e8b4231e7940f64ca7355f393e52dc17c91511e5d896f
194 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/pbw?utm_term=teenage+mutant+ninja+turtles+movie+download+in+hindi+480p+filmywap PDF link annotation
    • https://datulexajolibup.weebly.com/uploads/1/3/0/7/130738708/53561254f4e9bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499651/normal_602e7551865dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416923/normal_5fd33ab74645c.pdfIn PDF document text
    • https://fiwetoki.weebly.com/uploads/1/3/4/2/134235589/3629221.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kigemulu.pbworks.com/w/file/fetch/144784035/pokemon_moon_galaxy_gba_rom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e5c7015-2ad7-4cc3-ab92-324010fe89f9/logic_pic_nonogram_puzzles_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df57955-2a7d-4b34-9a23-9bc2842cf772/baixar_livro_o_espectador_emancipado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ffc6e76-b3ad-4c85-9d68-041a44f66884/les_trois_mousquetaires_barbie_film_complet.pdfIn PDF document text
    • http://moxulolo.pbworks.com/w/file/fetch/144682794/machine_learning_research_papers_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea7f66e-f0af-457e-a95c-fb594563669f/algorithmic_trading_software_developer.pdfIn PDF document text
    • http://panuduxeruv.pbworks.com/f/nelufiden.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fedafb0-c977-4c36-9aef-8baae92a75b0/fitumugivaw.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/31231315294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/626c4e59-1a47-49e3-b619-d9d953be3063/how_to_pair_bluetooth_on_alpine_cde-103bt.pdfIn PDF document text
    • http://pigedigasexu.pbworks.com/w/file/fetch/144719160/vidmate_app_download__install_vidmate_apk_2018_for_android_free_vidmateapp.mobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad88764f-328b-4147-814f-24de39cf6aab/site_de_tlchargement_de_musique_gratuit_et_rapide_jamendo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1343963-5bd6-47cc-a9d5-ef0545be339e/kasamolaweta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3763bb6-70b2-44a5-835d-9aad7ff5f2ed/uncle_mikes_inside_the_pocket_holster_size_chart.pdfIn PDF document text
    • http://xiwitanul.pbworks.com/f/mastering_chess_strategy_free.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_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 6156 bytes
SHA-256: f55f8edcc6f05fe973e346e97a3996da33afdbc164c4f309d9923540e2ada79b
font_01_sfnt_off0000f93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 10620 bytes
SHA-256: af5e0a3177d631f296a5986240fc2b066df196d648ed602f775056d8c5654398