Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37bc766e66d16b1…

MALICIOUS

PDF

74.9 KB Created: 2021-10-19 22:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 116ab3c6f2ca5123c0aaabd6d0ab258f SHA-1: ff18014f9d8e33903d50b19f696a92ed15ae8ce3 SHA-256: d37bc766e66d16b19330e4f68d750889e5ed750c79ba55e20a67bc3a5374061d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. ClamAV and an ML classifier identified it as malicious, specifically a phishing trojan. While no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://aaronandanthony.com/userfiles/files/kifekaluj.pdf In PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/25663701770.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/xamuromusex.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/vaxisomisubedibiju.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/zatamifoxaxujija.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/datinuxelerex.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/60948201026.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/85279339295.pdfIn PDF document text
    • https://faceless.me/userfiles/files/vamubiga.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d0c9a73b6994b6c06dc2db7c157614db/woxevewenumapowipib.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff14531266---foves.pdfIn PDF document text
    • https://blokhol.com/upload/files/8982372903.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/fubanonaroguwetuva.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/vebumi.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/6970468066.pdfIn PDF document text
    • https://regenerateacademy.com/file/kazediwomamitumet.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/bogaxewizoxut.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/wulizivasavonakumumaf.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/59629882518.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/76512799837.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/60554561351.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/66338539276.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/21842978068.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BGAemAmcdTc/uplcv?utm_term=solutions+manual+to+accompany+essential+oilsPDF 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_off0000c1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 16844 bytes
SHA-256: 5339ef3870520e8805432e9c7bd6f56e173e043477a56952e9114e16eb6b030c
font_02_sfnt_off00010520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10520 10724 bytes
SHA-256: 29f0538359ed4eefdb2dfa74d25e9d47ef048ebe6559aa350e11d72640c08e9f