Malicious PDF — malware analysis report

Static analysis result for SHA-256 f744f410f59bc2ad…

MALICIOUS

PDF

74.3 KB Created: 2021-05-16 02:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e1b5278e7c0a7b2f26691697c1b96f29 SHA-1: 5b9e6eb1f7ab77b18d0420225fe9bc1c95eb3220 SHA-256: f744f410f59bc2ade90a6ce3401c9019a7bc93d61f86743303390397eef2702e
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The primary URL, 'https://gimoguvi.ru/strik?utm_term=how+to+set+up+accu-chek+nano', suggests a lure related to medical device setup. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://gimoguvi.ru/strik?utm_term=how+to+set+up+accu-chek+nano PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480884/normal_601305013fcff.pdfIn PDF document text
    • http://povisowalikim.scienceontheweb.net/glossary_of_investment_terms.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/chakalaka_recipes.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/ielts_academic_reading_passages_with_answers_2020.pdfIn PDF document text
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/topori_parozizagut_xegajasuv_xulikekedofop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368985/normal_6039169428a0d.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/16198420606.pdfIn PDF document text
    • https://winomawapaba.weebly.com/uploads/1/3/5/3/135334931/d61626b4967c8.pdfIn PDF document text
    • https://lerelapukuvi.weebly.com/uploads/1/3/0/7/130740054/3358272.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368758/normal_5ff411579b810.pdfIn PDF document text
    • http://dupuladusudired.mypressonline.com/metoprolol_tartrate_davis_drug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366406/normal_5fe3a27486227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424010/normal_600ef68a41308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474456/normal_600f834145a6d.pdfIn PDF document text
    • https://zidesefaw.weebly.com/uploads/1/3/2/6/132680856/xosoxulorunido_monodulekud_wimaloko_noxuti.pdfIn PDF document text
    • http://zaranes.getenjoyment.net/pdf_file_download_app_for_android.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/49436836359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384037/normal_606c87be3ac01.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/7d536cc7-4867-4a0e-88cc-5d868827c6c5/degelilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2db8f7e6-5eff-4c28-8a24-2f17b380e266/61669574559.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_off0000e57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 5044 bytes
SHA-256: 9c8b865b43cf8aced8c4a5dd73d33a36c8e4e838b46e76852e220c7a5dca2390
font_01_sfnt_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 10976 bytes
SHA-256: 3933e25bf420321dc37d08e9c3f2a2ad204cad825cf33fb6e77f0b0ad821b312

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