Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe61d00236c8a39c…

MALICIOUS

PDF

80.4 KB Created: 2021-04-06 01:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b93a7c1c9f468676acec2dd79987cbde SHA-1: 217fe1b6c904023ad07e956f2782de2fb4aebabc SHA-256: fe61d00236c8a39c1e184f7d45f646d4b9ab80c372fc062b8c76a486db2973fd
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 0.9994

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://nipisod.ru/123?utm_term=magento+user+guide+reviews PDF link annotation
    • http://wersita.space/simplify_the_following_block_diagramsypnog.pdfIn PDF document text
    • http://umkatrade.ru/kindergarten_not_following_directionsnyqkt.pdfIn PDF document text
    • http://thedefenseforge.com/kung_fu_panda_3_where_to_watch74mxe.pdfIn PDF document text
    • https://bikuxemigoveju.weebly.com/uploads/1/3/4/3/134373773/28cf6c6c8c13bd.pdfIn PDF document text
    • http://rawenspant.online/tintin_in_the_congotvt2m.pdfIn PDF document text
    • https://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/5513736.pdfIn PDF document text
    • https://tapulebuzaxu.weebly.com/uploads/1/3/0/8/130814605/555a71c1c.pdfIn PDF document text
    • https://tozubovudifudi.weebly.com/uploads/1/3/5/9/135973827/ponadilepazubexun.pdfIn PDF document text
    • http://pimolala.22web.org/64173676455.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/851298ae-2270-4cc7-a7ed-ff8a303d5b38/arris_modem_login_dg860a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0953840b-d396-4d32-94ce-73648103005c/14579701515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44582f66-a1ff-47f0-b185-0cf5fa3375ce/when_is_one_punch_man_season_3_coming_to_hulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e8e7b4d-d707-4180-a98f-03c56b0e5f2a/1998_coachmen_catalina_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2823a2f-707c-45c6-9d16-27f085b43631/vimudefiwegemivetaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93204cb6-c144-4a34-bbf9-33959395828f/calories_in_dunkin_donuts_everything_bagel_with_veggie_cream_cheese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58852538-68fa-4d0b-b01a-b7c064d696c8/74150536098.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_04ac90901c0740709a56c050877285e1.pdf?index=trueIn PDF document text
    • http://sosujogi.epizy.com/classification_of_analytical_methods_classical_and_instrumental.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a7d286e-f1de-4e74-a10f-48d00d36c301/organic_chemistry_synthesis_reactions_cheat_sheet.pdfIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_25d9b381ed1c4670883fa50d4fc6f186.pdf?index=trueIn PDF document text
    • http://likijanima.epizy.com/77656638729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2c9b397-bd1d-44e6-bf9a-7c397842ddc5/donugova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d7841e-bb8c-4983-af2f-2569a5bd7c6a/what_are_some_english_idioms_and_what_do_they_mean.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_off0000fc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC03 5116 bytes
SHA-256: 9bdabfdd5d7b1ce6dd720365f567b0e8a3ea473e59afb893dd85918cfd0c354c
font_01_sfnt_off00010d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D95 11388 bytes
SHA-256: 3be3f9277607c17aa0e2f74720ec2967d819c2042d3e218237a04ed31405a276