Malicious PDF — malware analysis report

Static analysis result for SHA-256 c921064c56e76f0e…

MALICIOUS

PDF

89.4 KB Created: 2021-02-27 19:46:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4a3e5e723912c3213404b6ae7aab1ccc SHA-1: de1d3faaf8ba3c09f65e25dfae15020a206f5ea0 SHA-256: c921064c56e76f0e7e716a382ba677a0d276efd030ac57172711f07db2743ca9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs, such as 'https://druttle.ru/strik?utm_term=descargar+contrato+de+arrendamiento+de+vivienda+urbana+minerva+gratis', are likely used to redirect users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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=descargar+contrato+de+arrendamiento+de+vivienda+urbana+minerva+gratis PDF link annotation
    • https://zavowajasobi.weebly.com/uploads/1/3/1/4/131406950/zawawebodofukir-rexubavovafuxi-lakolaw.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/b36jdJg/78949970274.pdfIn PDF document text
    • https://jarurozo.weebly.com/uploads/1/3/5/3/135320013/pumiwipaguwefowaruna.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/bAhiG4Z/logo_quiz_game_answers_level_14_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404488/normal_5fc655b30b97b.pdfIn PDF document text
    • https://cdn.sqhk.co/vofaruvukuk/axjjahh/tumak.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/fiLsXYr/crazy_games_zombie_mission_4.pdfIn PDF document text
    • https://togawikanow.weebly.com/uploads/1/3/5/3/135320583/bareri-zebozufuxagevub-vabagifunu-wozixadegomifef.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/d4ZKszU/at_t_office_at_hand_support.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/jijfsif/defense_legend_3_future_war_hack.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425515/normal_5ff22c175676d.pdfIn PDF document text
    • https://cdn.sqhk.co/buzulexoxuve/VifAOUp/1st_grade_printable_reading_books.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449183/normal_60241dd764028.pdfIn PDF document text
    • https://lilonukile.weebly.com/uploads/1/3/4/7/134767916/4099190.pdfIn PDF document text
    • https://cdn.sqhk.co/lebereme/hehiaLd/futurama_worlds_of_tomorrow_guide.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/novipaliwid/beauty_plus_apk_full_version_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/bodokuzajuvexatakusewat.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/butagabojevule.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/jest_coverage_report_directory.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/istqb_foundation_exam_preparation_guide_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/legend_of_dragoon_armor_guide.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 6744 bytes
SHA-256: ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425
font_01_sfnt_off0000fb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0F 5424 bytes
SHA-256: c2a2af32db165b6e85faef7caf01fdad02e4cbd401fbd413db3fabb47663324e
font_02_sfnt_off00010d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6D 3664 bytes
SHA-256: 2d7aa69cce40bee9bb1308eb6bd4b0b24ef446b7b6bbfbd63af86b251349f1d6
font_03_sfnt_off00011b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8A 11372 bytes
SHA-256: 2e0fa99f6b5f8a633b70464f0316ab187d3bf9684abd3e97f44776f1c469256e
font_04_sfnt_off000140d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D8 16240 bytes
SHA-256: 38bf8b4c0ea09ab7f411f253617ed0d86d1416a9fc6e4bdec1ba4f62e3559969

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