Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8f62d43addf1e0…

MALICIOUS

PDF

74.3 KB Created: 2021-03-11 05:27:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 071075e19d6fd35940fdee04ba306d9a SHA-1: 978139fd5b3505c30a3f606f2a42540e348fad36 SHA-256: 5d8f62d43addf1e0b62845030a05cc1107d0d508314dc586256554973394ab6f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=bose+cinemate+remote+reprogram PDF link annotation
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/zetixereku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443823/normal_5feff0d7136e2.pdfIn PDF document text
    • http://persequen.com/xivodegiwerewvd972.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/yLEXif5/battleship_mod_apk_revdl.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/3111195.pdfIn PDF document text
    • https://fejagirizow.weebly.com/uploads/1/3/4/5/134525681/soteweposizegofo.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/ieSwCii/43155529099.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/ihIidi7/rough_living_an_urban_survival_manual.pdfIn PDF document text
    • http://onlinesos.tech/sniper_3d_gun_shooting_game_apk_downloadn1sxd.pdfIn PDF document text
    • https://ninobajoxakatud.weebly.com/uploads/1/3/4/7/134702009/tebijivojoku.pdfIn PDF document text
    • https://zisidolig.weebly.com/uploads/1/3/1/3/131379992/tuxekulezelegig.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/DgggfWw/star_wars_squadrons_gameplay_no_commentary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_60228e9db317f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486193/normal_60372df6a5603.pdfIn PDF document text
    • http://like-store.site/official_vatican_museum_guided_tour43cmq.pdfIn PDF document text
    • https://dubiroki.weebly.com/uploads/1/3/1/4/131483307/lidunabizariralimifa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483837/normal_602e6f3fe7327.pdfIn PDF document text
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/ribalifomidiziv.pdfIn PDF document text
    • http://reduslim-shop.website/734950661401h0lh.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/interpreting_human_pedigree_worksheet_answersmqg33.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/Tgchdhc/83180425991.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000e570.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000e570.bin)
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_de6c456bb2ac4e9dacb919306ff57a65.pdf?index=trueIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_ebf5c2ef0aee427da55d8bc3eceb7a2d.pdf?index=trueIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_74e04c0d02534bfea8b7b35f044c1827.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_c3d6ae5c47354da6968f20f9aadff0da.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 extracted file (font_00_sfnt_off0000e570.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 5268 bytes
SHA-256: 78290aedd5aa97bbd60981364bc5f9191443e2f46817ec770734acabbb54c331
font_01_sfnt_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 10632 bytes
SHA-256: 53456f6c33243ad9dc01e5073b2ec5f38a2a832493e976efb460f2485537848c