Malicious PDF — malware analysis report

Static analysis result for SHA-256 36258829f596ec27…

MALICIOUS

PDF

72.5 KB Created: 2021-03-23 18:36:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ae22b0667051f0e31aebafa4a7b16861 SHA-1: 51665aa93a36eb0df41586793f7584bcc5134b11 SHA-256: 36258829f596ec27bc99bc51e389138103ba3c30a86eec1e35df2ec5f7f1ee2e
142 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. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/award?keyword=autocad+to+pdf+converter+free+online PDF link annotation
    • http://bozesedixek.mywebcommunity.org/78142917092.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/jagegcG/67821875657.pdfIn PDF document text
    • https://cdn.sqhk.co/rovukupovumo/hdiifgd/skull_wallpaper_hd_for_mobile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415327/normal_5feb6904cd0e8.pdfIn PDF document text
    • http://keviboxe.iblogger.org/44131796391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470223/normal_6030fb2c14f8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464082/normal_600817d3c3192.pdfIn PDF document text
    • http://mudixefibewab.mywebcommunity.org/fudixefavigalelurikisu.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/how_to_live_365_days_a_year_in_hindi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421474/normal_6004a88699e73.pdfIn PDF document text
    • https://cdn.sqhk.co/fagijopi/Qjahijb/road_trip_bucket_list_ideas.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/google_search_by_photo_app.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/50028285160.pdfIn PDF document text
    • https://cdn.sqhk.co/dowufagit/UghjivA/fnaf_vr_help_wanted_song_by_jt_music.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/debussy_suite_bergamasque_prelude_sheet_music.pdfIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_34472d75fbb4404db7bc56c367e1f105.pdf?index=trueIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_5d9fb63e781740cfbbdd28419678c7d7.pdf?index=trueIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_013de7ebeb2c4307832c324c9e35a563.pdf?index=trueIn PDF document text
    • http://kutunuwe.epizy.com/topalekabafebulavopilifis.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/26893573294.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/hyperion_capex_planning_admin_guide.pdfIn PDF document text
    • http://fafiwokewe.epizy.com/aprender_ruso_gratis.pdfIn PDF document text
    • http://bovaxibeloxev.rf.gd/26082212082.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/33564273507.pdfIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_97cf84f08f844259ab4bdda032f503e9.pdf?index=trueIn PDF document text
    • http://nolawasewunut.epizy.com/70905169961.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_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 5020 bytes
SHA-256: cb7987f2bd1a32c837ca0dbe1fcac201a3a606ed04c06d9b4eff2321af398627
font_01_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 10716 bytes
SHA-256: 121882ab4339fa6bfafede7172e5e913c3edac97d82edab00da6587e38351403