Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef22f6217588bd86…

MALICIOUS

PDF

74.6 KB Created: 2021-04-20 19:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b83e23d3d9c7d0e7a2292749c7d634ef SHA-1: ea256890a221da7c270d032f2f651166465c2cda SHA-256: ef22f6217588bd865689c5184a7faa8ccc5e966fc36e96914864db38164c4855
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a phishing/malicious document. It contains numerous external links, many pointing to disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://bologen.ru/strik?utm_term=calculating+volume+worksheets+5th+grade PDF link annotation
    • https://worojipe.weebly.com/uploads/1/3/1/3/131382243/8947622.pdfIn PDF document text
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/badowedifomaze.pdfIn PDF document text
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/wulunixox_tokisutajeri_xorebixinidida_xomojisugi.pdfIn PDF document text
    • http://logunesunoj.medianewsonline.com/cassegrain_antenna.pdfIn PDF document text
    • http://sajitalunaded.22web.org/27179966162.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3379ce7a-b1db-4eab-ac9c-85c229c8e70d/nexawun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/351098fe-197c-45e7-92a3-06d58e2600be/procreate_drawing_tutorial_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a51c62ac-632a-4d8c-9388-a6b9f1572e0a/navy_correspondence_manual_2019.pdfIn PDF document text
    • http://dawivek.rf.gd/zenosibosukajoro.pdfIn PDF document text
    • http://dopovis.myartsonline.com/44474271761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ab39d6-0260-47cb-be00-8825ceccca5b/html5_self_closing_tags_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/899041cc-2755-40ba-a137-0300456af0c4/diradas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51c152f8-d368-4f3e-8dc1-ca8a6dfdb9f4/nufomebagikajafemaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e7fb0f4-d5da-4759-a038-cc0aa6914de4/54280038839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d05c175-6001-4fc3-aa99-77a71fa95fe0/21098066912.pdfIn PDF document text
    • http://sobavetugobi.epizy.com/tascam_dr_05_recorder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fee102a1-d1fc-419d-b921-c4de4635cbf7/kesitaxawabukapisaxuseja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb95fe6e-56d5-42de-8995-817828318a14/lewejexor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4560c29-2327-41d0-a972-6d61a13351f6/vagobarakorubenuniroxuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc58946-d31f-43f7-9953-35153a5a5573/singer_fashion_mate_7256_error_codes.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 5600 bytes
SHA-256: e650866734f1f5ba08ae6f1d390725cfc4ea816a38e30a6c2703b43e4892b4a4
font_01_sfnt_off0000f941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 10480 bytes
SHA-256: 0f5dccb6b2bc285d6e631b857cb5806ea5faae9979d5fae62449f4b06c0943f1