Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8d06129680da70…

MALICIOUS

PDF

83.6 KB Created: 2021-05-31 12:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2ce91b4a28fc69c3a38dd194b3a7dae4 SHA-1: 1f7ea3b057dc9f14fb542353af012e377b890b3b SHA-256: 6c8d06129680da708ece99228ca90eaa652eec3f6f7e63d1ccfe31032d0997d7
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 0.9997

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://kuzutuzo.ru/123?utm_term=esp-+01+esp8266+wifi+module+datasheet PDF link annotation
    • https://tarakemutelomul.weebly.com/uploads/1/3/2/3/132303353/8414053.pdfIn PDF document text
    • https://molilavavabofu.weebly.com/uploads/1/3/5/9/135989114/a0c683.pdfIn PDF document text
    • https://mimuromujalu.weebly.com/uploads/1/3/0/7/130739347/wabotiridawimezuxak.pdfIn PDF document text
    • https://sowerijowirikuj.weebly.com/uploads/1/3/1/4/131437515/mipoduwebovonefar.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/f37330fa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390381/normal_6051cab994f60.pdfIn PDF document text
    • https://kavuxidawikux.weebly.com/uploads/1/3/4/0/134000359/xarezez.pdfIn PDF document text
    • https://mukojemugasab.weebly.com/uploads/1/3/5/3/135314074/921107.pdfIn PDF document text
    • https://gixoloxivut.weebly.com/uploads/1/3/4/0/134040336/xofugawovivugixupeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382187/normal_5ff3dd0fc1425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482648/normal_60592c090f983.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5e037c22-ca76-4139-bf5f-fb32a93c06a3/8581576677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/845e75a0-e409-4641-ab0f-2c25a2fdcaab/singer_stylist_834_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0698ea05-5683-49b8-a787-ff74a9642f69/2012_jeep_grand_cherokee_computer_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/252b7c53-001d-435b-a475-66ed7251b92e/xexusore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e66a859-51e0-426d-b6e2-d7fce613c638/what_does_jelly_mean_in_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b7e8939-18e7-4747-b799-6e872948ce6d/55126574834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6a181b2-1047-49d0-b0ea-367dbb5276c7/metal_gear_2_solid_snake_nes_rom_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c185e7ab-d308-4736-9627-047a4a83f6bd/sekivom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3cf1f3b-6301-4192-97cd-74ec71f3e235/best_answers_to_self_appraisal_questions.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_off0000e9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 5716 bytes
SHA-256: 1da06e744ac1d22a23455d46dba493ae7c28c4b8def8d705c07af6585d76f4cf
font_01_sfnt_off0000fd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 17224 bytes
SHA-256: 65efb37f1958d029fe6243d5eabbd72bf7729379827c02e43b2ebb1aaa049279
font_02_sfnt_off00013157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13157 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333