Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e18647ebb0ab0c6…

MALICIOUS

PDF

78.6 KB Created: 2021-06-09 23:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bf4ead2e61acad0b5d21f06ec2ef5747 SHA-1: 40969a8e8fbb8974a01f3a1276a5a51419043893 SHA-256: 3e18647ebb0ab0c655a4a6d870003e777c483ad0a1d02daec77c235f1022528c
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 0.9990

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://smidgel.ru/pbw?utm_term=subway+surfer+happy+mod PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387924/normal_60043ea9ca785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_5fd136c64ec41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466175/normal_5ff282c31b71c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414491/normal_5ff8f3603682c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368758/normal_5fe45bbee4e55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390999/normal_604476404244f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470408/normal_6025b90ce3c1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405459/normal_5fc9d9a1765b9.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4426279/normal_60afe7c94ba4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477635/normal_5fdad4c710ec4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372682/normal_5fc8ecad80d3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5fffcb9f2bc35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1ff35c4-885a-47e2-b49e-79a3b720f74d/viper_car_starter_instructions.pdfIn PDF document text
    • http://mijatonevu.pbworks.com/f/john_deere_4020_service_manual.pdfIn PDF document text
    • http://redelaw.pbworks.com/f/discografia_completa_de_emmanuel_descargar_gratis.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144418776/how_to_use_chromecast_with_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37da0f38-7280-413e-b9fa-60db357c3da5/samsung_55_inch_tv_tu7000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/018789d8-4937-42a6-86bf-f53b67602599/wukarovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a83529fb-19b0-4781-a7eb-6cef7d6bdbdb/install_audacity_linux_terminal.pdfIn PDF document text
    • http://wevapejatu.pbworks.com/f/pesquisa_descritiva_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e43904f-23cc-440a-91f3-f79787dd89be/cathedral_raymond_carver_symbols.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/057e1d6a-4ad3-45ef-a20b-b451e668301e/anthem_chapter_1_study_guide_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d58e733d-3a49-465a-82e6-83f38519e433/99666560072.pdfIn PDF document text
    • http://xefobukeza.pbworks.com/f/khiladi_786_movie_songs_mp3_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 5684 bytes
SHA-256: fee640e3c772efde35209ef897be63444ab447fbd714374bb9089937b5b5b245
font_01_sfnt_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 10592 bytes
SHA-256: bfbf6ee2e3c660ed67feb9bf24d39a163f6888c33a570da929f140f038e82f73
font_02_sfnt_off000117d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D1 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2