Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d12b76658672368…

MALICIOUS

PDF

78.5 KB Created: 2021-04-07 15:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5028f2248739a4a629978cbd3207f7af SHA-1: fd356388dda81b140973417d5a2f6fa899c8b59b SHA-256: 9d12b76658672368ba02f0a9ba14e758740a3d3518ec9b916941a16d803e7ab9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://druttle.ru/strik?utm_term=what+is+the+best+sink+garbage+disposal PDF link annotation
    • http://pasagotijaweti.iblogger.org/kerakoll_biogel_no_limits_datasheet.pdfIn PDF document text
    • https://wemodolitafuroj.weebly.com/uploads/1/3/6/0/136055174/lanikivimezesorufed.pdfIn PDF document text
    • https://vukajikabazaxeg.weebly.com/uploads/1/3/4/7/134711597/bozurixesi-pibuwig.pdfIn PDF document text
    • https://vinatisuxuzelo.weebly.com/uploads/1/3/4/7/134770563/1204635.pdfIn PDF document text
    • http://pipavomiz.iblogger.org/88749079512.pdfIn PDF document text
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/254e2599ff2.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/01fc14e5-ddc3-442b-9f07-8cd0efcf3f56/36385107536.pdfIn PDF document text
    • http://gewizisoje.rf.gd/71695381923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b553301-f409-4193-afcf-ea45bba071ae/la_divina_comedia_en_ingles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70197a6b-6a57-494e-9dd7-fd52dae0ed7d/piruvigufamemitadopezes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3491a6a0-a793-445a-897f-9bdcf485be72/81944328024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b4a5c33-de10-4cca-8b8b-2cd0952596b2/order_to_read_halo_books_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da98b548-e102-454a-aa6e-6b15456bcb21/choral_warm-up_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b568fce-1951-4775-ae88-6b1e2f9d966e/vagoxelusapawowomajunulus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83ce4062-9c71-43f3-b62a-1524bc16a0c7/61453071655.pdfIn PDF document text
    • http://sozogakuvigoxev.epizy.com/kujuxoxaxuroxul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/621f38b8-82c0-4821-9d85-69c6d09f1c0b/kifikogizukubusili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43d7a205-8cab-4e91-8d46-dfee092f4527/81562047472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b67b491-2f65-45b7-a043-2d9a332ed177/legetuvofomemugiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e54070f-634e-447b-83f0-e75c61066e74/does_wealth_make_you_happy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/027ba5ed-0767-4e06-82db-547e3f81f18d/69767998176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f2bbe64-43b3-4e27-a4c3-cfc66c44fa27/febipuf.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_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 5440 bytes
SHA-256: 115ee6b8bc107f966e951a52c64adfad1262b7a9835052a009b3dc1a057602ad
font_01_sfnt_off0001063d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 11220 bytes
SHA-256: 4a39aef74fe6533604f0487095e7050ea3bd9cbe6ee989e20f7ed40fb0904ae5