Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b269fd892a7336…

MALICIOUS

PDF

72.6 KB Created: 2021-09-09 06:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d44be6495aa06dce21131b7de613d89 SHA-1: d1af32e6a6670e5442b9a08d342a24c596b803d8 SHA-256: a7b269fd892a7336389675fd7ea13bb131306c42384c4b38a7900660f8ec6f26
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, some pointing to disposable domains and exhibiting link farm characteristics, suggests a phishing or scam lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation for client execution, potentially involving embedded JavaScript to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://studiotecnicodama.it/userfiles/files/59541251537.pdf In PDF document text
    • https://cengilli.com/icerik_images/file/52360975113.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161348549bb022---97368598482.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/11144015360.pdfIn PDF document text
    • http://uteambio.com/upload/files/fegenuveripama.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/39382870361.pdfIn PDF document text
    • http://teresachild.com/upload/files/40997590959.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/44e431509e5ae9fdec41ea819c4388c1/kosubunekinavezitudiwusap.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/70361300728.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/80270961693.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/67191970222.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/kadalefema.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/vugajok.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/fafuren.pdfIn PDF document text
    • http://climtech.com/files/files/92344141737.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/zovotoden.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuvelebi.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/kuwaxakizulefazidara.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/60689642093.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/debopepiduvej.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/49122634734.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/45555146412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mod+menu+hack+apkPDF 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_off0000bbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD3 10460 bytes
SHA-256: 2456084161340825f9f92c836cfff71c401b7beadee785d5dc5d65be18eac2a3
font_01_sfnt_off0000d356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 16148 bytes
SHA-256: 08505c5d4af53c4cb6f45c179389d586334436137809654d61af4a0739785cfc

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