Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9cf2c322f0aa38…

MALICIOUS

PDF

76.0 KB Created: 2021-03-22 19:14:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1f464a563bd6ffe40c060664ab2dadbe SHA-1: b39c6bd23292e3a207507b81b7e9ca151e8366f3 SHA-256: 4e9cf2c322f0aa38209f621af69add1a4e938253578884d80ee1473609af08b3
134 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 0.9991

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/award?keyword=hafele+lighting+catalogue+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381534/normal_5ffa36d99869a.pdfIn PDF document text
    • http://gazozasi.scienceontheweb.net/budgetary_planning_and_control.pdfIn PDF document text
    • http://dasazopemobor.mywebcommunity.org/sasisubiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467577/normal_601d82cc55132.pdfIn PDF document text
    • http://teroved.22web.org/skyrim_ps4_cant_change_load_order.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458848/normal_5ff1d0e6e3463.pdfIn PDF document text
    • http://neditaxuvim.getenjoyment.net/erste_binomische_formel_bungen.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/metubevozisul/10715553006.pdfIn PDF document text
    • http://giverez.epizy.com/best_air_injection_iron_filter.pdfIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_675ea36da7074053b3dfcdb162f6eee5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52feec2-7db3-4a6b-9cdf-73236bf07eef/house_of_cards_s1e1_script.pdfIn PDF document text
    • http://fofuxolisemaxim.epizy.com/sum_column_in_rdlc_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/cie_a_level_biology_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88e0407d-2144-4543-8944-9f045ef76983/walking_alone_at_night_in_the_city.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c657745-34a4-4bc9-91ce-ddc20fda5a64/where_are_humminbird_depth_finders_made.pdfIn PDF document text
    • http://zegogorovajesu.epizy.com/hematology_manual_book.pdfIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_70978263f3694f40be5c252075cd9f4f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12bbd877-a2c3-4333-aa01-df7d26e0429e/wodotun.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/samsung_galaxy_tab_2_7.0_gt-p3113_battery_replacement_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/47639791348.pdfIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_2512184e2c9846229fa46d0b88023d7e.pdf?index=trueIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_32329ca521964e11998630471a836bd6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ee7ef41-9972-4963-9a4d-fcb62d117272/digitech_rp55v-00_manual.pdfIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_abea13b472f947d8a612444ba03ecc3f.pdf?index=trueIn 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_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 5104 bytes
SHA-256: cd24967bcde796dc23c84381a25f71b3df4ad58b59383f4d823e55852d93fb90
font_01_sfnt_off0000fc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 11600 bytes
SHA-256: d073a76b6192d6c8e54834c354cbbd5f4bba3cb265af5a6fd32812e85c0744aa