Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c820cb4826981a5…

MALICIOUS

PDF

76.4 KB Created: 2021-05-29 07:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 11d6f0ec2a4bb1f4fae353c952c028a3 SHA-1: c651e7004c1169edb2770008e2d8252dfb167278 SHA-256: 8c820cb4826981a5b2dafb9c93230e7d549d2c3028c6a15444f7805858f607a2
156 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 0.9989

Heuristics 5

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=ferdi+tayfur+filmleri+full+izle+%25C3%25A7e%25C5%259Fme PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476140/normal_5ff304d5de32d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486742/normal_604f18337e8be.pdfIn PDF document text
    • https://tetavezodumop.weebly.com/uploads/1/3/4/6/134645623/kixogubekupore_pipeforapu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446494/normal_6002dacedb337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417405/normal_60333c4e0a89e.pdfIn PDF document text
    • https://nebomigefut.weebly.com/uploads/1/3/4/3/134359696/fibabiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421943/normal_5ff94214621ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390664/normal_5fcd0daecdaf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447878/normal_60145a021b276.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481528/normal_6008ece826c23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461763/normal_5feb5e25d9830.pdfIn PDF document text
    • https://vulajavup.weebly.com/uploads/1/3/4/6/134683256/pogexo.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/a61e3725-df9b-45b7-9bbb-88040cd614ba/why_is_my_sims_4_cc_not_showing_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d494478-fa69-4819-bd46-8c689f6811a5/lirr_babylon_schedule_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee1572db-4270-4a5b-9c33-73c2a55382d6/toro_power_clear_180_carburetor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31944189-8a6e-4828-8c82-5aa620c91d49/the_organic_chemistry_tutor_jg_face.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/083c22c0-ff47-464e-aac8-b47fd055aca3/84580343495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/073f650b-d286-426d-a359-ee3f34e426c8/kokemiwigosopika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e9d290-01b3-4f42-9fd0-39bc691ca36c/kujelegebepumos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a453e2fc-910a-44d6-8066-5cec5e815384/zopedelajunepepexeresid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5734bb2b-ffe7-4f07-b16f-fb99301eca6f/7_most_powerful_mantras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/273c1cfd-f2da-4e43-8448-eb7fd616ca12/snow_white_grimm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/424ca471-2978-4eaa-9078-a4c83bc00489/wovajofobizaritinomipiles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cdcd7d1-5216-4e79-9b01-cda6732239eb/fallout_4_all_map_locations_perk.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_off0000d362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD362 5412 bytes
SHA-256: cd2b902ab27820ff711e09d285930b6d03618ebd696801c1274a2162be3e9ef6
font_01_sfnt_off0000e59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59E 11052 bytes
SHA-256: 93d7fcbb78a7a32a08604dda6d68f69fed280ed78b87ef61b679b04ab6b60bdc
font_02_sfnt_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 17112 bytes
SHA-256: 8d931078a8bda077e62b6226989e9ca7a204b5b2ded984cec863dfc844f848f3