Malicious PDF — malware analysis report

Static analysis result for SHA-256 61fa889e2bea79dc…

MALICIOUS

PDF

86.6 KB Created: 2021-04-04 02:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3fa3e0209d992a546143a4b5ed9a2f4b SHA-1: ee1efe56eb5b8907147432d36350601abae7a40e SHA-256: 61fa889e2bea79dced8c98472c2420817759d1d0646ca3ed086d28e347580d13
186 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many of which point to disposable domains and are likely part of a link farm designed to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing and trojan activity. The document's structure and embedded links suggest it is used as a lure to drive traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=difference+between+bill+of+exchange+and+promissory+note+on+the+basis+of+acceptance PDF link annotation
    • http://livemavuxedu.getenjoyment.net/41960046594.pdfIn PDF document text
    • https://cdn.sqhk.co/dulunukosep/hdGjbIv/new_archaeology.pdfIn PDF document text
    • https://cdn.sqhk.co/fazejitev/jfPrnHd/artsy_powerpoint_templates_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468571/normal_5fc8b24076836.pdfIn PDF document text
    • http://dobuwiwitevotir.sportsontheweb.net/physics_today_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_60392d9b52ea5.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/ctqPhjg/turbo_racing_unlimited_game.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/83973332529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_6009dfb9739e4.pdfIn PDF document text
    • https://cdn.sqhk.co/makafabakuna/btChe0W/nikola_tesla_net_worth.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/oialhel/talking_ghost_app.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/bambusa_vulgaris_medicinal_uses.pdfIn PDF document text
    • https://cdn.sqhk.co/zirimikuj/Rhc3ZVh/26384054722.pdfIn PDF document text
    • https://cdn.sqhk.co/viwedanej/iggjdih/hardest_space_invaders_arcade_shooter_games.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/hbpgd1s/68138494493.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/gfjfDkF/safari_for_mac_10._4_11.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_73d8ee3e2ce6427691ba085f6bff0d96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gonima/belegigoz.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/bidevajukijumowimin.pdfIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_366c68d151b846e3b31146cbb46a6cad.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_fa585111309742529e710fa8ca17598e.pdf?index=trueIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_ecb4e6ce0b24489aaae1e9e1b1ba3a06.pdf?index=trueIn PDF document text
    • http://fuvarijes.atwebpages.com/arthropoda_classes.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/22740048323.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/57025152365.pdfIn PDF document text
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_56cdd95361e74c478995503cb01784b4.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB9 5968 bytes
SHA-256: 44d68f21353fb689bde21b46b59c6a72f3de494bab9b13809ad228240dc879e0
font_01_sfnt_off00011201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 10572 bytes
SHA-256: 0b3fe94239e90eb7337007997594792d723e723749a5e8d4dce7b1eefa4e28fe
font_02_sfnt_off0001362c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362C 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8

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