Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cb4ac7f20e2ec2…

MALICIOUS

PDF

69.1 KB Created: 2021-03-12 16:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a302da8eafeab6cdd45dfaea2f79cca2 SHA-1: c40853a77f86c52c2a0e423315c6d53f25c0eaf5 SHA-256: d4cb4ac7f20e2ec283f7b8bca2e7943b59daf696769766ab1c0ddf0d9a4002a0
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and link farms, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to PDF creation and potentially misleading text, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/award?keyword=alias+grace+margaret+atwood+pdf+gratis PDF link annotation
    • http://miwewumexurigan.sportsontheweb.net/4844084198.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/how_to_use_the_stealth_cam_card_reader_for_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_6025c84e0ef56.pdfIn PDF document text
    • http://fanutoragozogow.sportsontheweb.net/vivanugozu.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/ihjjGhf/58252890576.pdfIn PDF document text
    • http://ruvujagefeko.mygamesonline.org/13015763476.pdfIn PDF document text
    • http://zawopim.mygamesonline.org/66328098150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427528/normal_6009fe28c213a.pdfIn PDF document text
    • http://nurigoluda.mygamesonline.org/28246519945.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/61008905771.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/what_are_the_10_major_sins_in_islam.pdfIn PDF document text
    • https://cdn.sqhk.co/leburogutu/TeOdhnI/yellow_jacket_bee_or_wasp.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/how_to_reset_thermostat_program.pdfIn PDF document text
    • https://cdn.sqhk.co/xoraxuvonaf/vghgo2g/zombie_survival_apocalypse_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375886/normal_602432f82d564.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/mifagepamutati.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/ti_89_titanium_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_603d534d862f9.pdfIn PDF document text
    • http://medemukiduba.sportsontheweb.net/certified_honda_outboard_mechanic_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dafukip.myartsonline.com/vocabulary_for_ielts_free.pdfIn PDF document text
    • http://sadoboxijowem.myartsonline.com/60601943604.pdfIn PDF document text
    • http://tuparibuju.atwebpages.com/where_to_drop_off_donations_for_the_homeless.pdfIn PDF document text
    • http://gixopiv.onlinewebshop.net/20821514704.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_off0000d0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CD 5556 bytes
SHA-256: 262e0548b00f3cc1c7d3fcc99ec0f5482927ce94c24f469795b11a06bcbc1539
font_01_sfnt_off0000e3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 10088 bytes
SHA-256: 2b44bc667c06e6e2defabe81c2d294b4a948de3214a1168f8f005e0bde37a22e

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