Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81f3d60e1716052…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 04:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5bb74143b5ae4574f1fc66458182f4d2 SHA-1: baa5e70c2a9c947dd2f97bb6be2e0f255342dee4 SHA-256: b81f3d60e1716052db6a4945a230f752bd01c98d75b710dca2684639725ca520
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading malware disguised as legitimate software. The presence of embedded JavaScript suggests it may be used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=download+screen+recorder+kimcy929 PDF link annotation
    • http://nigerseedindia.com/uploads/zipujelivewu.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/puguxopunixusut.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/8957699682.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109141844194383.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/82718086861.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/fanopilukazarupatemodan.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210919085618593.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/topefiweregikaxoxivuwujeb.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/19848323634.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ec1fea13d15788c7e874ca934c0b75e0/38714116178.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/98275370286.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/nojujadulabenubivefunug.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/99762109178.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/d04553df219b579315b9b8de5cc697e1/lulonuwamagigosetopug.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/48729344885.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/25610982923.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/marolexanixajofate.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/bawenosaj.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/81714646529.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/83444901736.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/80593343624.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109190017194465.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/kigebimexaker.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://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_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 17908 bytes
SHA-256: 83bf7cc6677f15609f7074507ae7b0fe88039f4706b49a6d987b4f415d7ccee9
font_01_sfnt_off00010bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 11012 bytes
SHA-256: 53e9e50fc64b82d092cf58de899b7e814a0bffdecb617ca80e0fdcb36003c70a
font_02_sfnt_off000125b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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