Malicious PDF — malware analysis report

Static analysis result for SHA-256 b509c765c647f78a…

MALICIOUS

PDF

74.7 KB Created: 2021-06-04 15:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: dea1da63dcfe9de9b28933b66d5cbabd SHA-1: 5729e074a82a96a552dd56d4f016282ef0767782 SHA-256: b509c765c647f78aadedd79e34bd94979be83f566975bd3028b8b2ce3ec89ce3
226 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9999

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://crewmak.ru/pbw?utm_term=planisferio+con+division+politica+y+nombres+y+coordenadas+geograficas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450502/normal_605ee9ff59350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490961/normal_6057b42846d12.pdfIn PDF document text
    • https://denelabi.weebly.com/uploads/1/3/4/1/134109088/a7f9cdece02f9.pdfIn PDF document text
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/xatizojutalabix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406202/normal_5fed9d50a204b.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/5492382.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486201/normal_6000d4b8d920c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503791/normal_5ff4c7adab778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427793/normal_60699f95c7b9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_604b70d36af24.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/6db81d44-450b-4e50-b896-82b41729a39b/png_background_picsart_hd_photo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f157d430-3a4a-46ee-90ee-8596ddf9ccc1/87531642348.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/f/66016671315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ce6148f-14f9-4f43-a386-0ecbf9f9b486/scary_movie_1_full_movie_in_hindi_dubbed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aabdea3e-4726-4078-97c9-28bc199cdd51/grocery_list_for_alkaline_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36bbe86a-91ce-4112-8c63-b6d4740d8004/how_to_reset_breville_bambino.pdfIn PDF document text
    • http://kufavuva.pbworks.com/w/file/fetch/144426513/84776467845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d004b68-8377-47f5-a577-48e377aaf794/how_to_start_investing_in_share_market_for_beginners.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_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 5776 bytes
SHA-256: 294a0e538335fa651e0411b9171ffe4d7642f83383dcfa8c8c390aee7f0ed878
font_01_sfnt_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 12044 bytes
SHA-256: f5eac88ff044c8a32f8a36f93ae77f526836feb1e278e54535361efec165f90b

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