Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97a0f1395193e66…

MALICIOUS

PDF

82.8 KB Created: 2021-03-11 03:51:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 68215d8459807b7e48a682e91ca3d32f SHA-1: 51513c92ee29054931e2824ba085e06e19383122 SHA-256: d97a0f1395193e66c11140d79490e11e4552e3c51404365b2414a721610c9f90
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and Weebly hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the nature of the link farm suggest an attempt to manipulate search engine results or distribute malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://xezojetit.ru/123?utm_term=same+header+footer+all+sheets+excel PDF link annotation
    • https://juwexulomo.weebly.com/uploads/1/3/4/3/134385858/dewepimidakarobuvupe.pdfIn PDF document text
    • https://vexuzunudupugez.weebly.com/uploads/1/3/0/7/130740013/1524991.pdfIn PDF document text
    • http://krokoboko6.xyz/secondary_school_teacher_cover_letter_samplerdxkv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460694/normal_5fd7c42f6baa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380882/normal_60313d30bb493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386851/normal_600a69fbdee42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470223/normal_60106c9f1cfda.pdfIn PDF document text
    • https://kuwumezebuxe.weebly.com/uploads/1/3/4/1/134131528/lifuzavigoxuben_tewimafus_jezigolipule_jebesiminivor.pdfIn PDF document text
    • https://gererojakomez.weebly.com/uploads/1/3/1/1/131163960/5c3b1385ec5fee.pdfIn PDF document text
    • http://jemaxawiju.22web.org/kapurakakuvamos.pdfIn PDF document text
    • https://rogupogadagome.weebly.com/uploads/1/3/1/3/131398605/5072593.pdfIn PDF document text
    • http://eurostore.info/best_c_programming_online_tutorialz3utr.pdfIn PDF document text
    • http://xesebufawif.iblogger.org/5247702069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469828/normal_5fe8727c6dda1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453134/normal_5fed5dc5a51d4.pdfIn PDF document text
    • http://xusonawifofi.iblogger.org/zen_yoga_book_in_hindi_free_download.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://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_4421881de5fc4fe3a42e8a1aa4d9649c.pdf?index=trueIn PDF document text
    • http://lewimidofi.epizy.com/internship_project_report_front_page.pdfIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_755232d573fc4b058a4a5cf05ceba932.pdf?index=trueIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_7d7d5f1896504165b593487e464fe6bf.pdf?index=trueIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_2582985fd0734f708f42f649a5987730.pdf?index=trueIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_a7dbb3be0d1e4a79a09b9d3ec3cb6f8b.pdf?index=trueIn 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_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 5068 bytes
SHA-256: 121c6e112a992f253f89a634004b01473fab318444fb124b6f01e9b20a8510d8
font_01_sfnt_off00010b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6E 10552 bytes
SHA-256: de829cfddbd01a7f198770b32171c7aa782455734bfa437d265a01a76b6a3ade
font_02_sfnt_off00012f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F96 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34