Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95c318bd384ceba…

MALICIOUS

PDF

73.2 KB Created: 2021-04-05 07:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2a517aa7f6fc0373b6bb4ce8735eb03f SHA-1: 749227d498dfafbaaba137f35cbfbb65c9505402 SHA-256: b95c318bd384cebaf86da7b3d8077a6f3ff4ae778628d41ec6b7821f9c34e1e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=descargar+himnos+mormones+en+espa%25C3%25B1ol PDF link annotation
    • http://wozuxel.getenjoyment.net/apa_citation_guidelines.pdfIn PDF document text
    • https://ronikirene.weebly.com/uploads/1/3/5/3/135393313/eb8aba374558f4c.pdfIn PDF document text
    • https://cdn.sqhk.co/nukebomevobe/iejbia6/autotrader_south_africa_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mazonixun/yhfoBjc/marketing_plan_promotion_strategy_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/cuja5Rc/pure_flix_priceless.pdfIn PDF document text
    • http://pinerapidsrr.com/netflix_altered_carbon_season_2_release_time3z2rx.pdfIn PDF document text
    • http://1xbet-registrat.site/good_vs_bad_story_ideasgfs92.pdfIn PDF document text
    • https://dabikosetizoje.weebly.com/uploads/1/3/4/2/134234987/243be.pdfIn PDF document text
    • http://batmbatm.ru/all_time_low_chords_piano_sheet_musicyxuq2.pdfIn PDF document text
    • http://trysalon.xyz/sugadob3mt4n.pdfIn PDF document text
    • http://plsale.pro/80355419977m5wva.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/kumog-zojubi-vakomikufer-pivatubazuxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_5c5e1a8eeaf1408eb059f05c0270264b.pdf?index=trueIn PDF document text
    • http://zujisofivo.onlinewebshop.net/area_of_triangle_word_problems_worksheet.pdfIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_1ca0f750336f42e8b6cdfb7e99b4551b.pdf?index=trueIn PDF document text
    • http://kabuzore.atwebpages.com/android_activity_tutorial.pdfIn PDF document text
    • http://moxosutemow.onlinewebshop.net/puritepikujujeseguderesir.pdfIn PDF document text
    • http://resilasijajatil.myartsonline.com/assainissement_eaux_pluviales.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_off0000dd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 5560 bytes
SHA-256: 397f5adc6e26480658efbe57d116a384bae70d46d0c50143172fc816676551c5
font_01_sfnt_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 11684 bytes
SHA-256: 55cdab4cfb3c40842f8e90bfb4fa587e551e041384c7577ded206c5e8eb09c41

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