Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e8aff7c13a565e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-08 23:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dedf6f2c8eaeedc1142eeef6e0b1e219 SHA-1: fd394de00f3c6bc4c48f46936285739bbc70d4bd SHA-256: 61e8aff7c13a565ebda837a6f3c56bc9f443a409cfc712b116e1e802162910fb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The presence of external URIs and a link farm heuristic indicates the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=az+screen+recorder+pro+download PDF link annotation
    • http://csc020.com/userfiles/file/20210901161717_d5j2w8.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/kotojufadupeze.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/rogifetasuz.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/dilokeveberibipuw.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/ripasajakofuwi.pdfIn PDF document text
    • http://0048.pl/48files/file/53736706555.pdfIn PDF document text
    • https://medpressa.ru/files/file/lefitu.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/49592481395.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/joronunobukokag.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/41326592765.pdfIn PDF document text
    • http://vkts.se/userfiles/file/busavedixunozefa.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/sanif.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/9250d5b898ebe7fef8f320b9acb4b333/72090555174.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/16683900390.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/lopelogakoba.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/64168377335.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/demodo.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/tojuzaxape.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/xaberorevo.pdfIn PDF document text
    • http://czyxchem.com/upload/files/45476488144.pdfIn PDF document text
    • http://master-vin.ru/files/file/27840545719.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/59370442184.pdfIn PDF document text
    • http://sushi-belovo.ru/files/ropaxelegisivetawujex.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_off0000d438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD438 17228 bytes
SHA-256: aaa1625d04e3f205709d69efbfadefa05c6274f44edd1811a5db02b9e73de823
font_01_sfnt_off00010051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10051 10444 bytes
SHA-256: b802564ce2a668a0f926512cc9582e985aa1b53ec6c939f73e09053921dce6f3
font_02_sfnt_off00011842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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