Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36f2b0a17f96aee…

MALICIOUS

PDF

92.9 KB Created: 2021-06-10 15:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: be77e8061ac9b0fea922c596794c6b5d SHA-1: eccc639c8c3fe5b413410a69765d08a5a9f26eb2 SHA-256: e36f2b0a17f96aee7b2c5732f295f7d43c8ceef2f3fab0e13e56ccdc97d7654b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pixomot.ru/pbw?utm_term=free+english+speaking+course+pdf PDF link annotation
    • https://jaxuvoxet.weebly.com/uploads/1/3/5/9/135979876/8506799.pdfIn PDF document text
    • https://kimubewej.weebly.com/uploads/1/3/5/3/135329621/mibixujobugupi_vifegemapomudot.pdfIn PDF document text
    • https://bogevojozoluki.weebly.com/uploads/1/3/4/7/134708627/joligebolejosez_nixefemanufene_xujipakixuwajik.pdfIn PDF document text
    • https://bederoka.weebly.com/uploads/1/3/4/8/134886295/xadij.pdfIn PDF document text
    • https://zenuxemevobimog.weebly.com/uploads/1/3/4/7/134756414/9722310.pdfIn PDF document text
    • https://zanolidades.weebly.com/uploads/1/3/2/6/132695759/f94b17.pdfIn PDF document text
    • https://nivenenururela.weebly.com/uploads/1/3/4/5/134585639/4273459.pdfIn PDF document text
    • https://vadisasezex.weebly.com/uploads/1/3/1/1/131163908/bubakevuwanip.pdfIn PDF document text
    • https://benowanazopawa.weebly.com/uploads/1/3/0/7/130740092/fajomifoxavotiwarut.pdfIn PDF document text
    • https://kolapudavuvoxe.weebly.com/uploads/1/3/4/3/134315715/nitiradan.pdfIn PDF document text
    • https://kazagito.weebly.com/uploads/1/3/4/6/134665665/4801187.pdfIn PDF document text
    • https://lomobesozav.weebly.com/uploads/1/3/0/7/130774973/fobubifufokanafoneb.pdfIn PDF document text
    • https://femanutokit.weebly.com/uploads/1/3/3/9/133999532/a047b49.pdfIn PDF document text
    • https://sevexuwajewedov.weebly.com/uploads/1/3/4/5/134508994/latiniwowinujagatek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1dddecc2-25a5-4220-8737-12ae3027c874/average_salary_for_medical_billing_and_coding_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e07451a0-8671-4c34-9963-86a94bba1071/joseph_joseph_m-cuisine_rice_cooker_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57a1b272-fbe0-40eb-a71e-50546406dbcf/68674968969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd7747d3-ca85-4540-87b2-bb4ee757b323/rajaxibodusasotafotoja.pdfIn PDF document text
    • http://joraxakegeg.pbworks.com/w/file/fetch/144729036/misty_vocal_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/110707f3-9f19-4b98-80af-72b6b15ded7d/5th_grade_workbooks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21842227-3e09-41bf-9114-3fc3a224d393/yaesu_vx-7r_manuale_istruzioni.pdfIn PDF document text
    • http://nafidob.pbworks.com/w/file/fetch/144983370/x_plane_10_global_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfb4982e-edc2-4a89-b5c5-5a36bdf1cf8b/how_to_open_sentry_1170_safe_without_key.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/f/how_do_doctors_test_for_parasitic_infection.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off00010976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 5236 bytes
SHA-256: 875a5c3b1f79867899db5a05fa4df32934edf6bdd5a33ac5a559056e68555aaf
font_02_sfnt_off00011b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B33 11324 bytes
SHA-256: ab5636c775383dcad4cb2e6c19655da3f04d41000726acbba692eb02218a83af
font_03_sfnt_off000141f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F8 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b
font_04_sfnt_off000156f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F8 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3