Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fdfc272d0c8946…

MALICIOUS

PDF

80.3 KB Created: 2021-02-15 08:39:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 812dc205457fa6d18c0fb2b3aca528d7 SHA-1: 47ac84ced77e3463e7256e72e4c1a86c468d7d7f SHA-256: 88fdfc272d0c89464a2eb3a0ef2b954430b44676492862b012f703a04aaebfbd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

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://seumenha.ru/123?utm_term=torque+angle+gauge+digital PDF link annotation
    • http://lidedapomegila.iblogger.org/adidas_youth_size_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/UiUhaij/recargar_celular_en_venezuela.pdfIn PDF document text
    • http://labagokawiboze.22web.org/nidekeromulixazamuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409813/normal_5ff71293bb612.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/sukataw.pdfIn PDF document text
    • https://cdn.sqhk.co/lezebulodiw/psPpiiu/dogolomovukalefekon.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/qkcJrhi/mobomibafusegasevep.pdfIn PDF document text
    • http://namedaun.fun/heroes_war_counterattack_com2uscil18.pdfIn PDF document text
    • http://nukels.xyz/goddess_kiss_guide_redditfknzl.pdfIn PDF document text
    • http://pixell.store/livery_bimasena_sdd_pnglg2fm.pdfIn PDF document text
    • http://italy50wow.pro/25414945993noc3w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407331/normal_5fcaa7ae40120.pdfIn PDF document text
    • https://nekitunanozot.weebly.com/uploads/1/3/5/3/135346928/571512.pdfIn PDF document text
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/8727345.pdfIn PDF document text
    • http://rujajabejeveto.66ghz.com/metformin_weight_loss_antipsychotics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490515/normal_60033d496cb8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471474/normal_6012f83d3d58d.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvapipitol/cbDifgg/fifa_world_cup_2019_live.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dolumuvi.rf.gd/baixar_netflix_apk_android_4._4._2.pdfIn PDF document text
    • http://gulavofi.epizy.com/caresource_medicaid_provider_appeal_form.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_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 4892 bytes
SHA-256: 27d708d406aeed5e30ade8e855bcefda08d35849abe3c42b78da36c2cb32aa7d
font_01_sfnt_off00010f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F07 10808 bytes
SHA-256: efb539e223a04e5e06b1f5aaac3a2d05f16fa0f85e4c9ffff71b4b31239e4849

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