Malicious PDF — malware analysis report

Static analysis result for SHA-256 0abbd46cd4f21228…

MALICIOUS

PDF

85.2 KB Created: 2021-06-02 05:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5b751b702ff82c58f0b8095b8b4f54e1 SHA-1: 9cb05737047f547307bbdc1fbe36f85bb4661e10 SHA-256: 0abbd46cd4f21228be52dd7f107259e60de6eaeda4c23591dd20d58fbc0eb529
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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/123?utm_term=angularjs+6+date+format PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477635/normal_605f8f1a92777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_60216e0f9b176.pdfIn PDF document text
    • https://gonufefimexej.weebly.com/uploads/1/3/4/8/134892828/b59ca139b0d804f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460055/normal_6057b7697c98a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386597/normal_606da0d2a2e73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451033/normal_5fed4bcfac99f.pdfIn PDF document text
    • https://jomibijavajele.weebly.com/uploads/1/3/1/4/131409275/vatelowuronuxa.pdfIn PDF document text
    • https://sawisede.weebly.com/uploads/1/3/2/6/132681865/woduvufefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411483/normal_6018719623491.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/41ce7986-ca22-4969-b9f8-08c2f30760bd/samsung_scx-4623f_wireless_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b02e61d6-f578-49fb-9acc-cb6ecdcf16fc/xugaxawez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8074da14-8df3-4dff-949a-61a03e5856dc/fefupixile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1936fad-238a-4ed0-afcc-8dde95c0bd8b/dantes_paradiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd6fa7f-96fd-4b2e-8986-aeea4bb61aa8/sefusepulirinuwine.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/w/file/fetch/144451155/how_to_write_a_resignation_email_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b9b9374-8c4d-486c-89d6-7180a7e1dbe2/gotedusubetojowev.pdfIn PDF document text
    • http://vifogajo.pbworks.com/f/60366906471.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/f/ver_serie_el_barco_temporada_2_capitulo_4.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/pupovovilugemubusol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78a11619-0d60-418e-b2f9-55f7acec680a/mechanical_engineering_colleges_in_new_york.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3598589-b5cb-4987-b8aa-c58de28fcf73/worksheet_present_perfect_continuous_tense_exercises.pdfIn PDF document text
    • http://mujusevo.pbworks.com/f/24087154364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0da2d65-5094-4012-872f-f14a82d05bbb/64662309287.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 13432 bytes
SHA-256: 8e9257c51097178c91846a41d29c06f4a511140cad042ba2c447c69b63cfd41a
font_01_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 5448 bytes
SHA-256: 213ee7fb1162c49399aaad0beeed026a693986ef4a042e197ad03fd0985d2a84
font_02_sfnt_off00011ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC0 11656 bytes
SHA-256: c4a7ebd9a3fa02621939bee16863f7490e8e0b4ee2777e658ed5aa608cc692ee