Malicious PDF — malware analysis report

Static analysis result for SHA-256 13238a38b6b4f053…

MALICIOUS

PDF

80.9 KB Created: 2021-04-25 07:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8fb777b820e6236c94eac1142bdaa63b SHA-1: 553d079eb9013568004bbf12e6d2afadffed1a42 SHA-256: 13238a38b6b4f05321a9195eac874535768011c18596c02366beaeb071343085
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm by heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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/strik?utm_term=mejor+app+finanzas+personales+2019+ios PDF link annotation
    • http://vawadofofasip.getenjoyment.net/18361919846.pdfIn PDF document text
    • http://bitipusefotas.66ghz.com/dd_crit_fail_table.pdfIn PDF document text
    • http://siluvuxifebul.medianewsonline.com/pdf_xchange_viewer_hide_toolbar.pdfIn PDF document text
    • http://wozovumorawoka.sportsontheweb.net/aesculap_instruments_catalog.pdfIn PDF document text
    • http://wegaturagifo.getenjoyment.net/gexedufixop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_606a369221f24.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/23313458121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446930/normal_601177d430bdd.pdfIn PDF document text
    • http://presentinsta.site/blender_uv_unwrap_tutorialaf4wj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476578/normal_5fe9628434867.pdfIn PDF document text
    • http://mpvideo.org/what_are_the_rhetorical_features_of_the_bill_of_rights51dpq.pdfIn PDF document text
    • http://bandalet.club/suzuki_quadrunner_250_4x4_years_maded9tme.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/b574934a-9ac6-46f0-b394-54a3f2cb0083/tosejat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdfd5bca-36ab-42d2-8483-1eb4b80bcd52/rosemarys_baby_2014_streaming_ita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dd7e433-5c13-4796-98cb-448f86fb1d6a/m_audio_fast_track_pro_drivers_win10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79fca16d-3106-408e-978c-f90d45666f46/bluff_my_call_premium_hacked_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78bc6c1b-22e7-4013-859b-436882411c90/constitucion_mexicana_articulo_144.pdfIn PDF document text
    • http://wujitotulofok.rf.gd/jebumozawova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5490c4d8-6382-4df9-998b-47778afb940d/how_to_make_a_ezgo_gas_golf_cart_go_faster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2a3fa21-f631-40c9-8c9d-fa86db4a40bc/microsoft_word_document_recovery_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9e26c0d-a828-4a33-bbb0-aff2e7392e62/55136650910.pdfIn PDF document text
    • http://robelonazolabo.epizy.com/what_is_considered_food_waste.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://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 6812 bytes
SHA-256: 705a40f2f1299da93398ac562f39fb8e280a7b0d058145836d6dafd55d8ad212
font_01_sfnt_off0000fc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 5508 bytes
SHA-256: d824ea82f4b8d0c949f6a66c323d93b9981d89dbb6822f7e18764c7b3e0c9d56
font_02_sfnt_off00010f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F16 11336 bytes
SHA-256: 95e4d2ca3c88902ed5973a4b402b78c075c1285f17a0a55fc991db5f90f9b511