Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c20a0f73a47b9bb…

MALICIOUS

PDF

74.6 KB Created: 2021-05-22 02:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2bfa93572b857cda0ec5f31fbf318d82 SHA-1: 2340e33dc84f17ebe53a85d39f6a8bd79ec90cf5 SHA-256: 6c20a0f73a47b9bb9e17bc9859a8405e5a8017ccc99c7282829e73656823119e
136 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a high-confidence heuristic identifying it as a link farm designed for SEO manipulation and potentially phishing. The primary malicious URL, 'https://gimoguvi.ru/strik?utm_term=rival+stars+horse+racing+color+breeding+guide', is presented as a lure for a 'rival stars horse racing color breeding guide'. While no scripts were explicitly extracted, the PDF structure and link farm behavior strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gimoguvi.ru/strik?utm_term=rival+stars+horse+racing+color+breeding+guide PDF link annotation
    • https://doxezasofe.weebly.com/uploads/1/3/6/0/136088479/rowusoris.pdfIn PDF document text
    • https://nesaresivegixan.weebly.com/uploads/1/3/1/4/131453215/nukotowan_dokodisesagawin_sejur_tatin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/28756713079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c6d1e50-cdb2-4aa4-ae33-07cf933e472e/edexcel_a_level_biology_b_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7eda7a0-eb46-4db5-ba5e-1bca828442c2/rapokemevosinozonofu.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/35882637212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/228ddf87-d126-46b9-8c12-88a0694e2add/38716487971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4523f9f7-9acd-4876-bc62-3871dedb09e9/wimegi.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/how_to_reset_radio_in_2006_honda_odyssey.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/frankenstein_penguin_readers_level_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/250556e4-727f-4f93-be64-55e38ffd40bb/supujiwono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfa37a6e-5cb4-454a-9c45-7f706737d86f/14326052380.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/9011525765.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/wallpaper_god_hindu.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/77316084183.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/bible_old_and_new_testament_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/187ccfda-a46b-4ab6-9480-f348e703c797/brandon_sanderson_books_ranked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a648bbc0-e825-4c6d-a75e-b61b259ac771/55337740553.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/dulumimejuzedalogobuj.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_off0000e627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 5408 bytes
SHA-256: 1a374145751f69b0941cdadb5a9f0c1a9d50a9e8249c92b12a35b59cab25b4e7
font_01_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 10788 bytes
SHA-256: aa3726a5756081e5255358c811ad76d4826b63ab8b0e092e31ad029103b8f471