Malicious PDF — malware analysis report

Static analysis result for SHA-256 d010bf91cf50a22f…

MALICIOUS

PDF

70.2 KB Created: 2021-03-24 10:03:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9895d6f824f25df7e5a842f54ca66296 SHA-1: 9bd936bfeb40909bf664163d8a62f17272de497e SHA-256: d010bf91cf50a22f6511ba7545213d2f1f4f8a504313ef0814cb911d1c2eac27
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

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://xajibur.ru/strik?utm_term=how+to+wipe+a+dell+inspiron+1525 PDF link annotation
    • http://lokunuba.iblogger.org/clark_c500_service_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/puwidebudojo/hjb3Dgi/pinatamasters_apk_android_oyun_club.pdfIn PDF document text
    • http://polnews.xyz/inglise_idiomaatilised_vljendid_jajknip.pdfIn PDF document text
    • http://kurutog.mygamesonline.org/powimotikufumutavozevuta.pdfIn PDF document text
    • http://blancop.xyz/29008687922hofii.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/what_are_babies_3_month_milestones.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/rU8jcgi/free_atari_2600_emulator_android.pdfIn PDF document text
    • http://olipaka.xyz/veranepefomefofukusalekai63al.pdfIn PDF document text
    • http://kotexob.iblogger.org/38593823335.pdfIn PDF document text
    • https://cdn.sqhk.co/xajegakagiz/6iapXGL/belazineb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://miwofalixi.rf.gd/pakug.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/ballade_pour_adeline_simple_sheet_music.pdfIn PDF document text
    • http://tagetebaj.rf.gd/livre_pour_apprendre_le_chinois.pdfIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/capital_adequacy_ratio_basel_3.pdfIn PDF document text
    • http://nubaletafo.epizy.com/infographic_timeline_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/25441815170.pdfIn PDF document text
    • http://vuvobulasuxes.epizy.com/new_alien_dance_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/vefadoku.pdfIn PDF document text
    • http://faxevimisosideg.myartsonline.com/60163580886.pdfIn PDF document text
    • http://veramok.rf.gd/able2extract_to_dwg.pdfIn PDF document text
    • http://muxuzuvom.epizy.com/xabibaremoz.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/84879655379.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/how_to_set_up_the_deluxe_ez_bow_maker.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_off0000d612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD612 5316 bytes
SHA-256: 1dded654ee771689f0ad5c767bd907f8d01a8ad2c3405f3113870248b3556ff3
font_01_sfnt_off0000e84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 10452 bytes
SHA-256: 055338cb995ebea9f21ee2040bc52edb2b7801d7d9738f59fe3b6c0265a312ec

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