Malicious PDF — malware analysis report

Static analysis result for SHA-256 411ad78a3d9ba043…

MALICIOUS

PDF

97.6 KB Created: 2021-04-02 11:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a1e45ec47960676e5590d01474f90dfd SHA-1: 590b3fdb6e39e00b05a5dbddce338b4ebd9ad59f SHA-256: 411ad78a3d9ba043be9ef7898c7f031a75fbbabc354ea40a468befbbeb62fc03
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://druttle.ru/wix?keyword=photosynthesis+lab+gizmo+answers+key+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374181/normal_5fe65e7d1bf57.pdfIn PDF document text
    • http://migerov.xyz/artcam_wood_carving_designs_freekjmcz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_604070e0841b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_605aaf1a0d610.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/oLLEcEp/algebra_nation_section_4_independent_practice_answers.pdfIn PDF document text
    • http://universal-kirov.ru/4966955035cyquw.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/wugixuwizupusururenaruju21awt.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/tecnologia_da_informao_para_gesto_turban.pdfIn PDF document text
    • http://gelupulofevabek.medianewsonline.com/aristotle_poetics_butcher.pdfIn PDF document text
    • https://cdn.sqhk.co/rekosiseweno/egcYjbk/35053330078.pdfIn PDF document text
    • http://cuzinfo.ru/summer_escapes_pool_cover71tcl.pdfIn PDF document text
    • http://tigibisolefora.mygamesonline.org/aristotele_filosofia.pdfIn PDF document text
    • http://geekcods.com/popcorn_time_game_of_thrones_season_8g10iz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_605b6db2ef179.pdfIn PDF document text
    • https://cdn.sqhk.co/podogule/hff5oor/66453331778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492275/normal_6057c93450d82.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/9c5a2541-b7ca-4b94-b34c-77f869f26862/63153878175.pdfIn PDF document text
    • http://ruzofugeru.myartsonline.com/kodunoxaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9063c6e9-1374-4abe-a320-d584d2acdd4d/fiwubeguje.pdfIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_fef15991f23d442880e43df2bf2f0887.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f3aca5e-03ac-4bd7-ba10-3f160f5573bc/how_to_use_ryobi_2000_psi_pressure_washer.pdfIn PDF document text
    • https://e714dd98-3e42-4604-aba1-6d4b2506b1a8.filesusr.com/ugd/742965_9fa27e65dcf64a779b22512973bf5876.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/861fc076-b946-4c78-88c5-a2756b40ee02/krups_beer_keg_instructions.pdfIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_f6cfd94d4f2b40b8b1a6b7a6d33fbd0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22de4b6c-e409-42e4-88fb-b21d791d0e94/52713958173.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 7104 bytes
SHA-256: a6db5cd8cc97aa1a718d08ed51ac7b4f396095f83eb4727eb530471b94eed6cf
font_01_sfnt_off00012bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFD 5904 bytes
SHA-256: 997fd1d3a79d609ed05b72bc1976a62a3e6efc5ebcaef187e601a66a2cd28de3
font_02_sfnt_off00014008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14008 2992 bytes
SHA-256: dc933cb56f6a40e47c9b856498c0e96625b11123a2e0247a1bebd58160dddeb7
font_03_sfnt_off00014c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C60 12248 bytes
SHA-256: 0cf685efa416cc20cd75be8b7f9ed0f8ff368c35682c900b5c28b72710eeb565