Malicious PDF — malware analysis report

Static analysis result for SHA-256 11458e55e78478dc…

MALICIOUS

PDF

69.5 KB Created: 2021-04-13 17:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4f288e651f4381367c2f3ad57756d7ea SHA-1: 6648488a8e00f31ffa507ad1130401299da316b6 SHA-256: 11458e55e78478dc3b30e4aeb3c5a693ea0f5c4dea40bb3e6f7567d36b6412c2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic of using many links on disposable hosting to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=dometic+awning+replacement+foot PDF link annotation
    • http://healthit.space/senoxub6o5w.pdfIn PDF document text
    • https://cdn.sqhk.co/zabeluzitema/IRicOa4/bingo_set_cards_for_sale.pdfIn PDF document text
    • http://fibipowokogo.sportsontheweb.net/67535955902.pdfIn PDF document text
    • https://vifelewumatorav.weebly.com/uploads/1/3/4/6/134669873/pitonobewotivizijan.pdfIn PDF document text
    • https://giliruba.weebly.com/uploads/1/3/1/4/131483170/3297798.pdfIn PDF document text
    • http://hurleyshamburgers.com/33429610378t57e2.pdfIn PDF document text
    • https://gexipatar.weebly.com/uploads/1/3/1/6/131606255/vokufipakidexapis.pdfIn PDF document text
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/wagupif.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/assurance_and_insurance.pdfIn PDF document text
    • http://hookup682.site/joruzejedipajaroo332u.pdfIn PDF document text
    • http://copyrightsupporteds.com/puviwasifinilivefepirojup7id1.pdfIn PDF document text
    • http://powerhdniy.space/wf-2630_printing_blank_pagestzdo2.pdfIn PDF document text
    • http://reznitskygallery.com/briggs__stratton_pressure_washer_pump_saver_directionslk49a.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/ajjYnif/14284300942.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/gh1gQja/nba_games_today_on_tv_canada.pdfIn PDF document text
    • http://regvoolkim.website/samsung_s10_plus_wallpaper_template7q5bl.pdfIn PDF document text
    • https://gupiwisida.weebly.com/uploads/1/3/4/7/134716232/901de15f.pdfIn PDF document text
    • http://randname.ru/wubagjhwta.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/1eec2893-f2e2-46dc-b20e-c313eef3f7cc/zedukisudogewikufewib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61ab772e-2aba-4ee5-ad43-7a6cf13ca8d1/libro_interpretacion_de_los_sueos_sigmund_freud.pdfIn PDF document text
    • http://jikelaxapexa.onlinewebshop.net/aircraft_performance_oxford.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_off0000d1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BB 5248 bytes
SHA-256: b225ff22b3f4acdde06fe6777357d0d680c800a9db1dcacf4ae62a1c061dc5d5
font_01_sfnt_off0000e39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 10988 bytes
SHA-256: d6842b4919e6ba8a2feab276cdbaf6affa0d8b114667937faa121697d01586aa

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