Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a039b25e290976c…

MALICIOUS

PDF

77.1 KB Created: 2021-09-24 12:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec615c635f0569b3008a7a4862184e0a SHA-1: b914cb48c03b78744410dfb738bf636ec9a141ac SHA-256: 8a039b25e290976cd8b4d12529792664e9bc1855d6727f8305b9a14d0ccba6e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one specifically pointing to a potential phishing or malware distribution site. The presence of external URIs and link farm characteristics suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=windows+mac+android+ios PDF link annotation
    • http://akcompany.vn/uploads/userfiles/file/fawipufanadojupokuwugen.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/9924387640.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/vugoketuta.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/2670953950.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/28971596556.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/68045748964.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/50371127537.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/96aede257f5abf761328d1fe73d28d90/podazebowigusinefitipez.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/toliwimimitedumebapip.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/59889112290.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/sizop.pdfIn PDF document text
    • https://rippa.pt/files/file/7312617750.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/jowadiwokodanegikizugobug.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/4829204895.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/76317131794.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/18349893916.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/xepili.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/butaxiwotodinovupib.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/23543490184.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/fireluverixezukuxikunoju.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/kuwizazineze.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/popivar.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fltbj3haiel54m54l265q6df8j/32773042770.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_off0000bf0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0F 20960 bytes
SHA-256: 15f15239c17e08cdeb301f25cd531173504be0a7692d6f77ee48fdd04f5749a6
font_01_sfnt_off0000f5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E11 10332 bytes
SHA-256: 134aa65303a2a1def7c680a4a279fa0e92443e2f668e2cbd8c6ea46ff02905e6

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