Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ded5e19a7da461…

MALICIOUS

PDF

70.7 KB Created: 2021-03-14 03:16:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2cb28f93853c674908338bfaee63cd46 SHA-1: 84fd12aa9134ba8763017b13e5005ad7be5ceb70 SHA-256: d4ded5e19a7da4616ddb5a9e5f7c4f98f38a9ec07bed2fd6f0a8d4d593cffcb5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs is a primary indicator of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/award?keyword=carmine+caruso+musical+calisthenics+for+brass+pdf PDF link annotation
    • http://salizurewaki.mypressonline.com/norma_asme_y14._5.pdfIn PDF document text
    • http://xawinewilapirog.iblogger.org/100_dollar_startup_book_summary.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/73c4472e-c487-446d-97ca-565ae400a5e3/what_happens_to_brenda_in_the_maze_runner.pdfIn PDF document text
    • http://sukokovevaz.atwebpages.com/tovebiripotage.pdfIn PDF document text
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_bbc378899cca4c14a57b921f67814a3e.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_bc95b93adb9e45b1969d9c4ee0b75fbd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c273696-fb8b-4249-bd21-eb977959909e/las_parabolas_de_jesus_para_nios_de_primaria.pdfIn PDF document text
    • http://solezujufor.rf.gd/friction_worksheets_for_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/286b25ec-73e1-4a8a-9ebc-2d909faff3fe/61359048716.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_a43638b4fd0f432e88a6fd6913e3858e.pdf?index=trueIn PDF document text
    • https://b8f7bc2e-5f90-466c-a76c-b8215bfdb3ae.filesusr.com/ugd/9717d9_6cc0f43193e348ea97c3bdaa5baebeed.pdf?index=trueIn PDF document text
    • http://jilerixam.epizy.com/61411260517.pdfIn PDF document text
    • http://puriruf.epizy.com/access_database_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a36e8f-6f9d-47d5-bfca-830183e38717/gukifozalogenizokebuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/how_much_does_it_cost_to_produce_one_episode_of_a_tv_show.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/kivavilexavimoran.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcce050e-5849-46bc-87b3-2d81a076d51e/57250325822.pdfIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_961a8f2c8bc04b1892f48b7843fecf66.pdf?index=trueIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_13f7bf88da93479d84e88113a392bd93.pdf?index=trueIn PDF document text
    • http://vabanenutulaki.rf.gd/elastic_heart_sia_piano_sheet_music.pdfIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_178ba4c8e3af44cfaab789c27374db50.pdf?index=trueIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_685b593a0079476dbf7a3c9ab65195fd.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_1931f024bb4440e78306a4055b940fa9.pdf?index=trueIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_41f4778f024e49b1996496ee657da380.pdf?index=trueIn 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_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 5440 bytes
SHA-256: 7df225b77d85811edfaf41432994586e45541ceb1f19c86e9470d82eafba8576
font_01_sfnt_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 10140 bytes
SHA-256: 990a0e3a60a82e62f814794ac1f3842192ec5dfa00f93a50c581615e8ae7f879