Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b52fabbbecd04d…

MALICIOUS

PDF

80.0 KB Created: 2021-03-01 22:22:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cd1b4d85191ec5d74f62e5a107658e84 SHA-1: 81144d98c51d16db4d8150127c5d18749a014142 SHA-256: 26b52fabbbecd04df22edf03310104a7161dea475e07c841c3f9935ccc58da55
166 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this pattern, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://jumiwimov.ru/strik?utm_term=405+toll+road+orange+county PDF link annotation
    • http://nevinidonet.mywebcommunity.org/56224765212.pdfIn PDF document text
    • http://everydayy.fun/90180745432gbbxu.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/how_to_make_natural_curls_curlier.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455194/normal_5fed60ad4a4dc.pdfIn PDF document text
    • http://agencymedia-ig.com/back_button_icon_for_androidjakxb.pdfIn macro / runtime command snippet
    • http://topcreditmonitoring.info/nevoxef7d1s.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/92497761159.pdfIn PDF document text
    • http://ovca.space/tiwinetumuzamog2nsxw.pdfIn PDF document text
    • http://rkconstructionsucks.com/555551368668rir1.pdfIn PDF document text
    • http://1-bog.ru/83565625743lwmxv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476765/normal_600da928d74d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450240/normal_60029ec522806.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/84339106105.pdfIn PDF document text
    • http://desokore.medianewsonline.com/41523595969.pdfIn PDF document text
    • http://makedctl.site/glencoe_health_chapter_11_review_answers4zxjh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482869/normal_5fca925e1be75.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/traducir_textos_del_espaol_al_ingles_gratis.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/resumen_el_juego_de_la_vida_y_como_jugarlo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploadsIn macro / runtime command snippet
    • 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
    • http://rofuvawitarul.atwebpages.com/holy_blood_holy_grail_audiobook.pdfIn PDF document text
    • http://zipulosi.atwebpages.com/tadisogogosir.pdfIn macro / runtime command snippet
    • http://jeborawaleko.atwebpages.com/30378672861.pdfIn PDF document text
    • http://wenares.myartsonline.com/29074792191.pdfIn PDF document text
    • http://wobanunep.myartsonline.com/63917718173.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_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 5124 bytes
SHA-256: 14a7e803524633c5c92271e8bdb8ba81be0f234a1e3741d66c888ef2c998f226
font_01_sfnt_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 10512 bytes
SHA-256: 1b66dbe1f2bf81f2d34ca7caa23f747e75285d09ee5af05723f58f29da336f1a
font_02_sfnt_off000124ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3