Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d4c6c452e3480a…

MALICIOUS

PDF

71.2 KB Created: 2021-10-02 18:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8f8fd19f95322b4cfc6495319ab6490c SHA-1: 9390e75c035cf7d71aed6ec92faa45c284890d30 SHA-256: 92d4c6c452e3480a9853578e725fe3b31cd1b95bdd1eeb0d0ab71850b36f6ef3
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 and are used in a link farm configuration, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=selling+put+options+for+a+living PDF link annotation
    • https://warsztatgdynia.pl/app/webroot/media/files/23337533298.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/ximeraveg.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/21270489831.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/51295342983.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/goxakosivatokejitelu.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/20764533499.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/87914353525.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/76g4bs5kmqiehd3nmk79j6h8g6/jozuwuvusikisi.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/genofeliwukuxomat.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/99126007445.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/jatevilixuromejuvodozal.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/rajumopexibe.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/76817903830.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210922185247.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/094fcd9819cc8a0f9c949020fff477b6/92859897942.pdfIn PDF document text
    • http://edallyshop.com/upload/files/43994021778.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/99282036541.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/gonezepogazul.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/77704622119.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/vimedofax.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/6587557871.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_off0000b146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC958 17740 bytes
SHA-256: c54993298a05a046debdf10663a2e517a9d880d10a5fdd39fe5663c4491c36df
font_02_sfnt_off0000f682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 10772 bytes
SHA-256: 54ff832e578b1148bb6ee3effb972adbc190a948cd5975dd2f4eef539c323312

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