Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc441950afd42db0…

MALICIOUS

PDF

82.3 KB Created: 2021-03-30 09:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c25fbce7236132d9597e2602c1ec1659 SHA-1: 705e6e3d3c6f4349a6d745c1729a02e70b012b6a SHA-256: cc441950afd42db0f817d1f451f3d1daeb28a3f86ec093dbae334791a17a3466
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 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/123?utm_term=acute+diarrhea+guidelines+2017 PDF link annotation
    • http://nomevufaneboja.mypressonline.com/3984642265.pdfIn PDF document text
    • http://futajef.medianewsonline.com/power_rake_service_near_me.pdfIn PDF document text
    • http://tijudiwulewanuw.getenjoyment.net/xojigukavixikaret.pdfIn PDF document text
    • http://zawazubiwezug.iblogger.org/carcinoma_espinocelular_oral.pdfIn PDF document text
    • http://gizovivomiz.getenjoyment.net/ramadan_calendar_2020_saudi_arabia.pdfIn PDF document text
    • https://jejegufixi.weebly.com/uploads/1/3/2/7/132740716/cce53734.pdfIn PDF document text
    • http://benaletuzulug.sportsontheweb.net/catholic_rosary_prayer_for_the_dead.pdfIn PDF document text
    • http://mafaregasinuviv.22web.org/fountas_and_pinnell_leveled_book_list.pdfIn PDF document text
    • http://paxejunon.mygamesonline.org/argument_essay_gre_examples.pdfIn PDF document text
    • https://piborubaladedos.weebly.com/uploads/1/3/4/7/134764427/9193173.pdfIn PDF document text
    • https://xavimunemu.weebly.com/uploads/1/3/2/8/132815343/rekokekebufisi_xenevakelaj_wurego.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/6c9a69c6-cd60-4741-a9df-79cd207b2224/76455677254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d61ca3a-d6cb-4422-93f7-0f86efe10b04/86315752928.pdfIn PDF document text
    • http://lumuwejonalar.epizy.com/stephen_ambrose_band_of_brothers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14bec1d-9626-49f8-aa11-2a94974b66aa/its_not_the_stork.pdfIn PDF document text
    • http://dozopedatofol.atwebpages.com/bansal_classes_study_material_free_download.pdfIn PDF document text
    • http://zokezokofanimep.epizy.com/rectification_of_errors_questions_and_answers.pdfIn PDF document text
    • http://xexopixubogupul.epizy.com/failure_to_notify_dmv_of_address_change_california.pdfIn PDF document text
    • http://rulamiji.onlinewebshop.net/gameboy_advance_sp_model_ags-101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2db6e940-e018-403c-a8ca-6b718b7b9a18/34798961898.pdfIn PDF document text
    • http://panurimo.epizy.com/2015_buick_lacrosse_intellilink_manual.pdfIn PDF document text
    • http://datidalumoz.rf.gd/bsc_modern_physics_notes.pdfIn PDF document text
    • http://guxenubegipus.epizy.com/bang_bang_saaho_song_pagalworld.pdfIn PDF document text
    • http://nolifixumo.rf.gd/tripura_pin_code_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdeb3f12-c38b-44d2-b229-08ee0c122fb1/leadership_style_assessment_tools_free.pdfIn PDF document text
    • http://kegunujav.epizy.com/penafopa.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_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 5596 bytes
SHA-256: ac6a1a634090c319614231948869206cf299e084f66fd062c498e48f340b7fd5
font_01_sfnt_off00011905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11905 10248 bytes
SHA-256: bede7199a01b49ad34fe2ed08216f59cf57fc684e22c6fb70b42722452515613