Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc8ee7354ea4b23…

MALICIOUS

PDF

83.5 KB Created: 2021-04-13 11:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 70cb07bb4e33652b3509e0bbe2b8ff79 SHA-1: 22f1cd019f3021c5c96e9b6fa3e3bb9146a7c76c SHA-256: 8dc8ee7354ea4b2373aba57a8b6388e4e67453ceacd899786e0ead7d8779c2d6
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains multiple embedded URLs and is flagged by ML classifiers as malicious. A specific heuristic indicates a 'Browser extension / update installation lure,' suggesting the document's primary purpose is social engineering to trick users into installing malicious software or granting unauthorized access. The presence of numerous links, some pointing to disposable hosting, further supports a malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://xezojetit.ru/strik?utm_term=what+is+semantic+analysis+in+nlp PDF link annotation
    • https://wivepeweg.weebly.com/uploads/1/3/1/4/131455463/xizuxokozowi_tovuvuk_vazubafotofud.pdfIn PDF document text
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/rolubef_galasavutuwa_romomozoje_gepipabupofuroj.pdfIn PDF document text
    • https://mozimokitazipa.weebly.com/uploads/1/3/1/4/131407977/jamipuwugavaxo.pdfIn PDF document text
    • https://vewuwoxefi.weebly.com/uploads/1/3/1/3/131379256/659170.pdfIn PDF document text
    • https://voxonevixes.weebly.com/uploads/1/3/4/3/134383310/a21592b4ab.pdfIn PDF document text
    • https://ketawajizaw.weebly.com/uploads/1/3/4/5/134528489/4448920.pdfIn PDF document text
    • https://tetagusupawuwag.weebly.com/uploads/1/3/4/5/134586179/8631321.pdfIn PDF document text
    • https://kazilapematif.weebly.com/uploads/1/3/5/2/135293457/29fdb53.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/75bb43db-3e6f-4d28-9fb2-b6924d6e3417/how_to_cite_online_sources_using_apa_style.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195996d6-1a7e-45db-a872-a16884ee06a3/6622431731.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/celebrity_look_alike_meme_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f4885a7-a5a3-491c-95ca-ad4cb1253c86/how_to_turn_on_ellipsis_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/sap_ao_2._7_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a090cfb9-8bd4-42fc-b26f-bb288c4a287e/tufuvorajawenapozano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1af62863-f772-4b49-a125-44b3bdd2646b/murray_rear_engine_riding_mower_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/zodoribobiximeditusimef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39fd9af0-1563-461c-9e1a-8e42e98da462/how_to_install_maxtor_onetouch_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14572852-011f-4508-8b4c-801adbdf7c86/jidixumelib.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/como_colocar_assinatura_digital_em_documento.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/blood_diamond_movie_subtitles.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/total_gym_1500_accessories.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC32 4868 bytes
SHA-256: 54b51737ddfe3054d221abb51c4910109167bec946f4789e878ebf8fe37c250a
font_01_sfnt_off00010ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 11088 bytes
SHA-256: fc440d526946c07ffaae2c22f2fd53c0a8150af38b9e62b4e613f8522621e1bb
font_02_sfnt_off00013292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13292 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176