Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d8d022973cb2f2…

MALICIOUS

PDF

96.5 KB Created: 2021-05-14 02:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 90e2818226f47bead7effdac45772432 SHA-1: b56a137db2367943473b2fc1f89c0adceda7bcb8 SHA-256: b8d8d022973cb2f26b16440347c300518c44d22f7fa59dd29e396c9d83223763
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users. The primary redirector URL, https://druttle.ru/strik?utm_term=casio+g-shock+rangeman+gw+9400-3, is identified as a high-risk element. The presence of ClamAV and ML heuristic firings strongly indicates malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=casio+g-shock+rangeman+gw+9400-3 PDF link annotation
    • https://putonikasobex.weebly.com/uploads/1/3/1/0/131070178/vupaxep_wefite_sizasabumo_sapopujofo.pdfIn PDF document text
    • https://fepagefifumowa.weebly.com/uploads/1/3/2/6/132681901/tisaxoziroxu.pdfIn PDF document text
    • https://cdn.sqhk.co/bowawugafux/bVmgiji/pba_bowling_schedule_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/kapipota/jipgjhd/tuzala.pdfIn PDF document text
    • https://penatiwateli.weebly.com/uploads/1/3/4/6/134617533/1342990.pdfIn PDF document text
    • https://makonajarozov.weebly.com/uploads/1/3/4/3/134341931/8301373.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/meludav/31067882903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e700610a-0bf0-4ff0-8308-0af1f37c5456/oxford_dictionary_of_world_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aafa089f-064c-4b83-9ad5-c297822d1aef/60162957356.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/phpspreadsheet_install_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/harry_potter_movie_8_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e330f2fd-5a61-42b0-a885-e1162937f855/76671929359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b90c1219-08e5-43b0-b1f7-efb943396e2b/video_games_to_play_with_girlfriend_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/texas_comptroller_eminent_domain_report.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/survival_of_the_fittest_quote_origin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f26815ed-7d6d-4a6c-b981-abc65d971aad/que_se_festeja_hoy_en_los_estados_unidos.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/sony_calculator_apkmirror.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a9a9b8e-77c9-4531-a7bd-0fbae1ffc0fd/boss_dd_8_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/20269270523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/effec749-8a5a-4a31-9bc4-8bd28b548c6d/wall_street_journal_mailing_address.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://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_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 5648 bytes
SHA-256: e5fcd51ee96335153a8d3f6896defc8cd205adfc097d3479d0764abe9ae3f3c4
font_01_sfnt_off00012892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12892 11840 bytes
SHA-256: 02917ee7d1374188e0d38ee7beee1fb03de46e99eefc4e445803077203d5d150
font_02_sfnt_off00015133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15133 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off00016663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16663 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c