Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d57529563d5d51…

MALICIOUS

PDF

78.8 KB Created: 2021-05-14 06:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22a5e03761ea2880820d7ba0ef0013e9 SHA-1: 69b4ba3516ed0f105ac3b2fe03ba4e445480003f SHA-256: 73d57529563d5d51c20e39b719fb2f782035331442e8e018c3ec5e4a613ec71f
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a high concentration on disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI findings point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://mezovuduw.ru/strik?utm_term=gable+frame+analysis+example
    • https://cdn-cms.f-static.net/uploads/4374517/normal_603f6636e6e16.pdf
    • https://static.s123-cdn-static.com/uploads/4489414/normal_5fe0827d37cd9.pdf
    • https://cdn-cms.f-static.net/uploads/4385617/normal_6054129926d52.pdf
    • http://sunufosabupes.scienceontheweb.net/64258143458.pdf
    • https://cdn-cms.f-static.net/uploads/4451556/normal_6051cbb943bda.pdf
    • http://wepisoja.mypressonline.com/9174765358.pdf
    • http://nevepojikita.22web.org/self_portrait_drawing_tips.pdf
    • https://cdn-cms.f-static.net/uploads/4409621/normal_6046c7c6697a5.pdf
    • https://cdn-cms.f-static.net/uploads/4369494/normal_602a052cf060d.pdf
    • https://static.s123-cdn-static.com/uploads/4415526/normal_5fcbd6dc4cf8e.pdf
    • http://gedirobidepud.scienceontheweb.net/bpsc_ae_syllabus_in_english.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gubogur.rf.gd/hipoplasia_renal_pediatria.pdf
    • http://pigutun.myartsonline.com/kogajofimele.pdf
    • http://kofepiropi.onlinewebshop.net/aisi_1020_material_properties.pdf
    • https://uploads.strikinglycdn.com/files/7310f094-639f-4e24-9e91-a7be58d680a9/what_type_of_poem_is_the_raven.pdf
    • https://uploads.strikinglycdn.com/files/f6f69cfa-40aa-4de9-8ffe-8d5c3354c30f/83206570386.pdf
    • http://gegokuberil.rf.gd/acrobat_app_download.pdf
    • http://vakazavitin.rf.gd/din_en_iso_9227_deutsch.pdf
    • http://visuvowimew.epizy.com/download_creator_gratis_em_portugues.pdf
    • https://uploads.strikinglycdn.com/files/fd6e39d6-4e55-4605-aa01-f4511f252ac1/75754848915.pdf
    • http://xukitekebuza.epizy.com/teposuvadifafajup.pdf
    • http://janodabo.epizy.com/bernarr_macfadden_books.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f63a.bin
34f39ee1e3fbbb3ad3c5a6b33114dcec47540d17a7497c7ba7065ac890e5b46a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 5388 bytes
font_01_sfnt_off00010888.bin
3b9b3feb1ed219c135f663b11f5ece67c45a370900629ced14a6b74ab5d871ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 11152 bytes

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