Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda8db6f24b28d8b…

MALICIOUS

PDF

39.0 KB Created: 2021-09-25 16:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b34629f413197c3a65f67deef79bbf89 SHA-1: 43be45ded9cbd1f606bcf8bd9fd60eb42e8c9d3c SHA-256: dda8db6f24b28d8bcba42b1da83f6b747c592c0a5b165ca99c2eed545bbb1f89
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to trick users into clicking. The document contains numerous external URIs, many of which point to disposable domains, suggesting a link farm used to distribute malicious content. ClamAV detection and ML classification further support its malicious nature, indicating it likely serves as a dropper for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8579

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 39 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://nguoigiupviec99.com/webroot/img/files/mewodoroji.pdf In PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/23045705599.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/a6a93609415039e8e36ecd0ec145b7d4/rolozoworigogumezujo.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/23339212958.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/16850538455.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/49992798440.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/86158022598.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/jeraduf.pdfIn PDF document text
    • http://czyxchem.com/upload/files/79532108050.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/77183005251.pdfIn macro / runtime command snippet
    • https://whatshoulditcostme.com/userfiles/file/movewinuleromedulekedarob.pdfIn macro / runtime command snippet
    • http://chromowane.com/userfiles/file/59700099545.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/6885846370.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/jegekuratujawonufus.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/40187238266.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/9121ba77fd7084b918bb4b891d191ca6/4389074975.pdfIn PDF document text
    • http://czyxchem.com/upload/In macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+take+screenshot+on+galaxy+note+5PDF link annotation

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