Malicious PDF — malware analysis report

Static analysis result for SHA-256 4110c4b1f0cb338c…

MALICIOUS

PDF

69.0 KB Created: 2021-03-07 16:04:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 019a928c9b8bf8d1c12d3eaff121ff59 SHA-1: d6b3a5931bf44c11e9ae60853125fc90f3bebfac SHA-256: 4110c4b1f0cb338c7e87acd2c636b4f6e09c0b5f9999726651c4b2a956abfb5c
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to contain search-related keywords, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://pelibifir.ru/award?keyword=does+gamestop+sell+nintendo+ds+chargers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366408/normal_5fcef894b27bd.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/kupabanenosomovasoguli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489716/normal_5fde108b8fd3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453560/normal_603db97229fe1.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/como_desenhar_um_livro_aberto_facil.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/how_many_carbs_are_in_a_vanilla_chai_latte.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/think_like_a_freak_chapter_3_summary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462985/normal_6022e29db345e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454170/normal_5fe3fd4a82685.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_703690835a2c42ec92392a873b049dd4.pdf?index=trueIn PDF document text
    • http://lajofekozorofa.rf.gd/rosario_dela_divina_misericordia_cantado_por_gladys_garcete.pdfIn PDF document text
    • http://gazugitub.epizy.com/alayamlo_pravesinchandi_song.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_0e507a2a9288431cb1368c30a83e9f17.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_95e538d269914ca89c0c072ccf33f1d7.pdf?index=trueIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_dc79901919f042a697ffbf27c678bc0e.pdf?index=trueIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/votagefuxulazozamupo.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_a10da206d5384daa855d301ace6e90b6.pdf?index=trueIn PDF document text
    • http://wiwugaku.epizy.com/gofukavegozerodujokagan.pdfIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_d1de29749eb64096be5ce05b7f11eb72.pdf?index=trueIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_24dadfa1180f4587985bb101d91b8be8.pdf?index=trueIn 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_off0000cce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE8 5488 bytes
SHA-256: 43ef1c3cafde6a4b836c0028b8a3f4d0788fe64e747f8cbec6a45283f60a849e
font_01_sfnt_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 12284 bytes
SHA-256: 2b0bdce7e385f15080802d5b258838a794364d242b1f520747618284175af81c

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