Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e195e4e0bc5bb1e…

MALICIOUS

PDF

84.8 KB Created: 2021-09-18 06:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab1629dfed48f18a51487a60a13f9ec9 SHA-1: c61ea43c47759d472bba36f4dd039d7fe07ef605 SHA-256: 6e195e4e0bc5bb1ed7734d076b7f9b5e1d8cb7a61ad271c725f8a4ac5a798d2b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://lmnn.ru/userfiles/file/66330607975.pdf In PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/64937964260.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/pipibuvase.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/0387eca9ac538ed02568ce3beba59a27/tonetovebez.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/141300006.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210904045326.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/loset.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/36339264.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/65461532549.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/15864894573.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/zafakavobanelusona.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/71019303776.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/24684243905.pdfIn PDF document text
    • http://chinalabware.ru/d/files/71353884117.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/mafuradetonowes.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210908225338_u12gym.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/nagenodaritefovan.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/11094413030.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/96129152913.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/20770200412.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/71889615442.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/vovobakegalutawem.pdfIn PDF document text
    • http://odumakus.com/uploads/files/dapipekaniwunulamewu.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/lonatejadogiwana.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/gajonivubepiriruxatizapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+latest+newsPDF 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_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 17296 bytes
SHA-256: 24315b75c7ed1b1040c57bed1a5c717b2fc36ebdcd70c334ed57bfcf6c3a516a
font_01_sfnt_off00011670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11670 10308 bytes
SHA-256: c8896fcf8e2b3497d1e9ab1847dc5ac54240cc0086ee292a0600b56bfaaba999
font_02_sfnt_off00012dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1