Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b713194d109d6c…

MALICIOUS

PDF

80.6 KB Created: 2021-02-07 11:54:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d60968de55300c69c7d30934260cc430 SHA-1: 53d2ac556bca3062599602b6a97678563b1ed9f2 SHA-256: 18b713194d109d6c4fc0c552e8cfe00ec5b9d88aa319dca7177819354061f264
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/wb?keyword=local%20calling%20guide%20rogers PDF link annotation
    • https://cdn.sqhk.co/noxisoture/igejedw/dual_monitor_tools_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/wusezofetib/6rigjeY/14273622274.pdfIn PDF document text
    • https://cdn.sqhk.co/fexejikexew/isEgdji/who_is_this_man_robert_cray.pdfIn PDF document text
    • http://piwakere.iblogger.org/anaconda_windows_continuum.pdfIn PDF document text
    • http://itslm.fun/rutekixabucexl4.pdfIn PDF document text
    • http://golden-bridge.pro/azur_lane_power_leveling_guidegg9t6.pdfIn PDF document text
    • http://bathforlegs.xyz/bujomenefoledizewabnilp.pdfIn PDF document text
    • http://carbackseat.site/xolitvlqe1.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/gfjhGqk/46800859609.pdfIn PDF document text
    • http://debodopox.iblogger.org/free_music_for_instagram_videos.pdfIn PDF document text
    • http://item-get.top/bejimifigutopupezg90sd.pdfIn PDF document text
    • http://swast-group.website/game_pirate_king_facebook2kpzj.pdfIn PDF document text
    • https://cdn.sqhk.co/fakosopalo/jdBhgkW/pinout_for_a_crossover_cable_connection.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/iiee2fX/35939029565.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://s3.amazonaws.com/sitozi/notification_android_app_code.pdfIn PDF document text
    • http://pizubape.rf.gd/babhana_mange_chumma_dj_song.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/wonderful_tonight_drum_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/zijukezisoseni.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_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 4848 bytes
SHA-256: 2bb209328b048e64e7b75c8fe36e94f2185b6a6e57fa73194897e87b8b2f24d9
font_01_sfnt_off0000ff38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF38 12192 bytes
SHA-256: 2279e01cde6c316c3d9531893a7cd1a8e68f7061fdc2f7bf67aa608811e5ce8a
font_02_sfnt_off000126e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E9 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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