Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7dee1bda49a1b7…

MALICIOUS

PDF

89.9 KB Created: 2021-04-19 20:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 04fbf28772b6c8f7812e37783c42d668 SHA-1: e6ea4de6a0aa509fe6bbe96a07ab9480d96021d6 SHA-256: 6f7dee1bda49a1b7e6db21743dc15ee98cf3636f0ce3ffd48ba7c1f390b023d9
226 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. It uses a password-protected-archive lure. 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 0.9996

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://zajinet.ru/strik?utm_term=thermo+king+reefer+container+manual+mp3000 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458417/normal_603ce80c71342.pdfIn PDF document text
    • https://rewovokikulige.weebly.com/uploads/1/3/1/3/131379935/0f9d6e8956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392864/normal_600f60118bbea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385434/normal_60356c3b7b50e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_6010636ed8330.pdfIn PDF document text
    • https://dovenokitumenu.weebly.com/uploads/1/3/1/4/131482991/rubowet-rufinoxu-jubev-relove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489588/normal_5fd100cde37e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374843/normal_5fc5f5cd61775.pdfIn PDF document text
    • https://veraroligesabo.weebly.com/uploads/1/3/4/3/134377370/runulamutad.pdfIn PDF document text
    • https://bapudemajupi.weebly.com/uploads/1/3/1/4/131438294/totab_jolapevajiw_dasamis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366313/normal_5ff65a463dd40.pdfIn PDF document text
    • https://morupataniseb.weebly.com/uploads/1/3/4/5/134502176/gefovinir.pdfIn PDF document text
    • https://ludiwutigavas.weebly.com/uploads/1/3/4/6/134697468/lemuwuzumugiloxu.pdfIn PDF document text
    • https://nawawuxilebop.weebly.com/uploads/1/3/4/6/134679594/vupofizebe.pdfIn PDF document text
    • https://kikosizijup.weebly.com/uploads/1/3/1/3/131379594/5329112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380090/normal_5fe964b8ccb11.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/4f707852-a84b-423b-8953-f989aac13b7b/88656299949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32eb6a94-2725-428e-be75-7f16b21d90e3/dirt_devil_power_max_pet_belt_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1807b16e-a298-4693-a708-4851e5a0b60a/contract_law_terms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d87f12fc-90a9-4216-be49-0227fa0d230d/vexolov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18139d1e-24c0-490e-929a-bc5bb708ef53/71417486386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f039abd2-6a23-4eea-b475-863c383c846c/dictionary_english_to_gujarati_free_download_full_version_for_pc_offline.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A7 5572 bytes
SHA-256: 023151b957d45d0576d52123228f9edbf65b54d7e8ab2b02f2b124a3d642df28
font_01_sfnt_off00012b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7B 14296 bytes
SHA-256: 6916a6ad49d8ecf7cb8f561424ad9f87dd5095f32244b8627f81fe414ab34f22