Malicious PDF — malware analysis report

Static analysis result for SHA-256 babb98a7ced59fec…

MALICIOUS

PDF

69.6 KB Created: 2021-06-05 23:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fcfd8b0c461f35804a934f895ce9b5e3 SHA-1: 3d0645904895c2596f3b329395ff7b21143c7e0d SHA-256: babb98a7ced59feca78047844acb56a9ba4c3fcd0f90dd84478f912cb9a6da1b
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary malicious URL identified is 'https://coretry.ru/pbw?utm_term=benim+hocam+matematik+video+ders+notlar%25C4%25B1+2020+pdf', which is likely used to redirect users to a phishing or malware-hosting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://coretry.ru/pbw?utm_term=benim+hocam+matematik+video+ders+notlar%25C4%25B1+2020+pdf PDF link annotation
    • https://xugomijomib.weebly.com/uploads/1/3/4/5/134578432/525f264.pdfIn PDF document text
    • https://dajitogaxafolix.weebly.com/uploads/1/3/1/1/131164176/rufosaxeg.pdfIn PDF document text
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/2731999.pdfIn PDF document text
    • https://gagemixe.weebly.com/uploads/1/3/5/2/135295047/wezalebexixu.pdfIn PDF document text
    • https://fefedajukuda.weebly.com/uploads/1/3/1/0/131070841/f3fa92.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/30c29491-23de-438e-b323-07127b00b0b7/jitterbug_phone_help.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ebb701-7e9d-4c64-bd4d-d1c0027317ae/keroforijonokebuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a04c852d-13e9-4d54-99c2-7b70e60c906f/gowodenujeziralogulik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e335d737-2cd0-4381-ae56-10b7b964036e/goraxubafezat.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/w/file/fetch/144642825/g502_hero_vs_g402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a96540-2626-4ff0-b27d-65953485d68b/jezadisivarobama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d93e22c8-7f71-46d9-a384-25d6fd90e5a0/how_does_the_quran_cube_work.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/f/nadizebapisumenota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d0f3c7b-78e9-4294-bd91-ec288e4174cb/34804865074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b433c5b-6c7d-4fab-86b5-64a64e69fe35/stopping_by_woods_on_a_snowy_evening.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70bbf692-5fa4-43fa-9cf9-f408958c9864/jomup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcd72ab7-bf9b-47b5-868a-f63c41dd2ad3/25984482013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2225dd43-50c0-499c-9f0c-171cecd04445/mtd_snow_blower_parts_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/333dfa23-688d-45b2-930b-d1ee3aa1e2ae/the_bell_jar_sylvia_plath_the_collected_poems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/284d4026-9b32-4819-a01d-b4e0a284aede/dd_starter_set_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47df8895-e6ef-4c30-9269-5b574e429560/36907446965.pdfIn PDF document text
    • http://xuladejuzor.pbworks.com/f/bg2_potion_of_superior_healing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/381b1e8d-1352-4720-84b8-09da4868f062/81393991978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d6b5f45-b3c8-4dc8-a70d-964a4e38f03e/how_to_reset_nespresso_lattissima_plus_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/555cdc84-56f5-47c3-819d-0630ecbfa4ce/mary_rowlandson_a_narrative_of_the_captivity_and_restoration_of_mrs._mary_rowlandson.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_off0000ccd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD7 5872 bytes
SHA-256: 473922b2b3de75651d43b6c41683a0ac9cf4d604721a16678ef1f9fbf220fb9c
font_01_sfnt_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 11616 bytes
SHA-256: eaf905ac1537e500e9b973d8455c50be4a1a50414498f9dc2005e8e03b9829d4