Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56656069b766a84…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 03:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2953e8723684a26d51c5102227341b75 SHA-1: cdcd5ff57d4a06100f0abe78f45a42e837d85c4f SHA-256: a56656069b766a84b4204c26cf458714ba063533d602abc0262149d284e18aee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is expected to redirect users to one of the numerous external URLs found in the document, which are likely part of a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614faf6774982---gomiwufat.pdf In PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/62871918942.pdfIn PDF document text
    • http://ecole.ru/text/images/file/9902550842.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/punezabulugilevoporejove.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/neremapazagozuzezuganuk.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/67720513844.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/41107747735.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/lalafakevatugolabiba.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/68754658349.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/nowewotigigolaselovevexo.pdfIn PDF document text
    • http://www.andreapondika.cz/file/pesilibutinekido.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/46254788171.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/kajezomemoxirup.pdfIn PDF document text
    • https://atlantidegattico.it/file/5398186196.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/tefipo.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/59960275270.pdfIn PDF document text
    • http://446888.top/userfiles/file/lepiregonumunonadu.pdfIn PDF document text
    • http://marketingnews.fr/images/file/lebivomavajetupo.pdfIn PDF document text
    • http://dezis.ru/uploads/files/84498000036.pdfIn PDF document text
    • http://hoachattn.com/image/files/97012298529.pdfIn PDF document text
    • https://onlinendttraining.com/files/84800359264.pdfIn PDF document text
    • http://robedecreateur.com/img/files/64096382716.pdfIn PDF document text
    • https://emmaushuis.org/pages/xepavip.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/53116305500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=layers+of+the+rainforest+ks1PDF link annotation
    • 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_off0000b2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AE 10480 bytes
SHA-256: 6abf19aac388937b61440fc3fe73c97b168ad6d0672c4305dbf353d1bbec3a1b
font_01_sfnt_off0000ca83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA83 15112 bytes
SHA-256: 6e66257153d3beb2b0acac7c93277ac95ed1a6f954d6c218a74ed4ae2cb7786f
font_02_sfnt_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1