Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46b2af2adc9c8ea…

MALICIOUS

PDF

74.9 KB Created: 2021-03-25 12:13:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 147d39b777936e37f9ab98dd1367a062 SHA-1: 85bc176ed05eb03255f4da7031a1ac5da4821879 SHA-256: a46b2af2adc9c8ea7ad4dc76b6c8024d39bc3cb825e491fbeca4d078692ee61d
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to disposable hosting and potentially malicious domains, as indicated by the ML classifier and ClamAV detection. The presence of a 'download button' heuristic suggests a lure to encourage user interaction with these links. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or redirection attempt, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/award?keyword=asciidoctor+pdf+change+theme PDF link annotation
    • http://all-gopro.com/average_salary_of_ethical_hacker_in_usa523s9.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/lose_yourself_eminem_lyrics_cleandtwmj.pdfIn PDF document text
    • http://cmbmarketing.agency/cosco_car_seat_expire_datezwkvo.pdfIn PDF document text
    • https://vomedizi.weebly.com/uploads/1/3/5/3/135312409/4fcd5c55170e131.pdfIn PDF document text
    • https://ginuwedisifixel.weebly.com/uploads/1/3/4/7/134744372/3456136.pdfIn PDF document text
    • http://carinsusa.com/portfolio_bootstrap_page_templateracvn.pdfIn PDF document text
    • http://kizunawinim.getenjoyment.net/90125743655.pdfIn PDF document text
    • http://fb-ig-violation.com/kegegibafenuzetvt67s.pdfIn PDF document text
    • https://xemavuvewo.weebly.com/uploads/1/3/5/3/135394060/komizujumumimokadabu.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/what_is_breaking_news_today_in_india.pdfIn PDF document text
    • https://lefusavuforuv.weebly.com/uploads/1/3/4/4/134490278/zibageralov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_b752c3dac77142ecb7654076e1999aef.pdf?index=trueIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_a87124d5cb1b4608b47320c1553288b9.pdf?index=trueIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/how_to_look_up_a_citation_number_in_texas.pdfIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_93dec3a85b0245dba62770c0e4728f9f.pdf?index=trueIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_11c4240e71c142b6a024fb919d916b27.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/224af8b1-b9ee-4292-8a00-aee106209687/diary_of_a_wimpy_kid_wrecking_ball_best_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeffe012-0499-4054-9d9b-da259f1153c8/mastering_the_art_of_social_media_by_ezee_and_natalie.pdfIn PDF document text
    • http://firiwigisu.atwebpages.com/vodawiri.pdfIn PDF document text
    • http://sajatuvireguta.atwebpages.com/tcnicas_de_anlise_de_dados_qualitativos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b33c2854-f8e5-426e-838b-4075bb856854/harman_kardon_onyx_studio_4_service_manual.pdfIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_9cb87a8eb42141cb9ce3df83450b9921.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/991d41a8-3d58-4e42-8ecb-bbe4cf6d4e08/twilight_midnight_sun_movie_release_date_in_india.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_off0000e6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 5528 bytes
SHA-256: f09d51e017026074a3b34342382d7bc3342ccb17785a6aa60f2ea0194d6963f1
font_01_sfnt_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 11140 bytes
SHA-256: 17417fa9433fddcf7f96acbb1e9a1861ef22c87edd15411f2071d06baf60abae