Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4817a3b65493023…

MALICIOUS

PDF

96.7 KB Created: 2021-09-21 20:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a207a72137c73ac2cfaec2fa9133870 SHA-1: 69cf753f9ec7b15e4fa453e993c63fe4c92aa148 SHA-256: a4817a3b65493023be4fd15a1ed4f309da507750e1aabe5937c8e352dcda4272
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://mondoaudio.it/img/uploaded/file/vejodiwejebijuporane.pdf In PDF document text
    • http://vantaidongsaigon.com/uploads/files/54935018341.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16144e73dae043---19349510300.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/89901260055.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/91880556672.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/22754061702.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/widunuzolelun.pdfIn PDF document text
    • https://12shio2.com/contents/files/kurilopejejo.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/zorosidogoniz.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210901224707_g6g45b.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/57088168214.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/batojabijeliro.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/93862390475.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/lafuxiriboxodafovoditizu.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/82332809237.pdfIn PDF document text
    • https://trainova.com/userfiles/file/15520441841.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/13243602726.pdfIn PDF document text
    • https://proxus.nl/file/14683986797.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/sipurulifarajukerojogejo.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/napesufirek.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/54850718055.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/wawowekutefonarujebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=adjectives+that+start+with+l+to+describe+a+personPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/58164931186.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_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 11016 bytes
SHA-256: bfa4eb443339fa3814496d602f6e87ba4fc28aa0483c877278df663556d88c15
font_01_sfnt_off00012e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E47 17888 bytes
SHA-256: 54fbf58a184b49e61b0e2f0efe01f3ed6929a79ba059165f66f63ff6c14d64d2
font_02_sfnt_off00015c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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