Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3f63769ede6a92…

MALICIOUS

PDF

91.7 KB Created: 2021-10-09 05:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9b24cb4c80d0b4e5b5ef895e48285d0f SHA-1: 24745ebd579d388b731ccfa8508a4adc3bf15010 SHA-256: 9e3f63769ede6a92b34a614da89e423ec0ad94082a5644e6feaf890f69fbcc5a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, flagged as a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and URL distribution suggest a phishing or spam campaign aiming to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 4

  • 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://onestep-tokyo.com/userfiles/file/99104288938.pdf In PDF document text
    • http://ryukatsu.com/userData/board/file/korawuzipagiwepetifexota.pdfIn PDF document text
    • http://trivio.it/userfiles/files/tijatekuwobedunafaxux.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/7524330756.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/47596911647.pdfIn PDF document text
    • https://granitnet.hu/editor_up/64174365167.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/sufobarebe.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/lupexitofano.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/rejunovubowovor.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/61908127048.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/33441644423.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/popojojawimutu.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/pozizevewaromebojavemumev.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161470d1a36141---taxelunurapaz.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/13957237109.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/1200375198.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/19025424150.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba048a33a7---mogivinefufumikoboraferij.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/sulofavimose.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/71135103555.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/numodexafen.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/bunirixet.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/3406933264.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/81423680213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=racoon+lifespan+in+captivityPDF 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_off0000fe00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11617 10600 bytes
SHA-256: d07bbdd2c31aac3c68116f1e7c81f739d224aa97578f08d591458440e803066f
font_02_sfnt_off00012e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7F 19300 bytes
SHA-256: 2f7722eff3e87cee03a378f9b6c1581d8cb9becaee0b3d7e63e700a9a1259aa9