Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ec09b1bfe8f9e6…

MALICIOUS

PDF

83.0 KB Created: 2021-03-05 08:52:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: db79376f32f40fe919841b5a518ca2e0 SHA-1: cff7267702093ee23b46ff32ecb76aa78f56ab40 SHA-256: 27ec09b1bfe8f9e658074e12db4ed5afdea4fd2f6552c35cf18acede22f82c66
166 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL leading to a suspicious domain. Heuristics indicate it functions as a link farm on disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://jumiwimov.ru/strik?utm_term=norse+mythology+books+to+read PDF link annotation
    • http://zedafemosefeguj.22web.org/john_c_maxwell_quotes.pdfIn PDF document text
    • http://creditstar-kabinet.com/viwavawebixogewuvofog4u8ym.pdfIn PDF document text
    • http://ruzopiter.iblogger.org/malayalam_movies_free_2017.pdfIn macro / runtime command snippet
    • http://7lessons.fun/nuevo_testamento_interlineal_griegoik9jf.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/ecb015b2-2ef6-4cbe-8cb0-9c9225ce085b/tutifesejefuz.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/70315284277.pdfIn PDF document text
    • http://diturasenupope.epizy.com/pigugitiwevebilo.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/spider-_man_2002_video_game_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a616ac72-5410-40c1-a1c9-e6ed4299d9dc/how_to_share_someone_elses_business_page_on_facebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf6ac89-0957-4b8d-9ca5-493643810a15/how_can_i_heal_my_plantar_fasciitis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e65720-afa1-44aa-b1d0-c1b19aa8d3dc/38130232313.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/nebaxavelowusi.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/91869826532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19b4060c-47e8-42df-a506-4a8852ef9f42/livusutepitosisen.pdfIn PDF document text
    • http://weralawubuzeg.epizy.com/44383952594.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/canada_visa_application_form_5257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f799b7e-7dea-4efa-b5f7-53493f56827a/kipamenorodavududaz.pdfIn PDF document text
    • http://malanawojuko.epizy.com/fepovuxuduji.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/14118111172.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/havering_school_uniform_shop_opening_times.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/358a951a-7989-4f2d-91ad-ea0504ce3a28/how_to_reset_router_from_cmd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb948e5-1f1a-4c2e-be19-24670fb843c1/modabowekukoj.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/lagu_owl_city_alligator_sky.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0876ea84-dd36-4ac3-884c-89cdbf8b1489/the_house_with_a_clock_in_its_walls_2018_movie.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://uploads.strikinglycdn.com/files/3fb948e5-1f1In macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 5148 bytes
SHA-256: 9f25b72cf4b27d665b07645dd56926aa310f8ead8641a0e0e3dd2e43fe891563
font_01_sfnt_off00010bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDF 10820 bytes
SHA-256: 1566b26b705934b5625bb105363ca3351454475903edb67d1d73db112b8ef6b4
font_02_sfnt_off00013063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13063 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c