Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff0cdb0e3b1f53e…

MALICIOUS

PDF

80.2 KB Created: 2021-03-05 10:06:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d9843bcfcd886d0f38e70b4597565dec SHA-1: 5da8e76b922418433a33f9166fffe27a01eebdeb SHA-256: dff0cdb0e3b1f53e416654edb371d00823c5a1a43464f5d6d7bc5315e2fe09cb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though garbled, appears to be a lure related to search queries, directing users to a suspicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/award?keyword=how+long+to+cook+sirloin+on+george+foreman+grill PDF link annotation
    • http://rasazajafatirek.mypressonline.com/34313465235.pdfIn PDF document text
    • https://megogira.weebly.com/uploads/1/3/4/5/134590171/lugufulebuxamoz.pdfIn PDF document text
    • http://nutetuxiv.mygamesonline.org/kujeka.pdfIn PDF document text
    • https://gunobapeve.weebly.com/uploads/1/3/4/7/134706327/lafezun_zarol_dudusagagukivek_rizigetet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471509/normal_601d5bad22319.pdfIn PDF document text
    • https://rudixesawemes.weebly.com/uploads/1/3/1/1/131163949/pubopitipanubu-zigumafi-tupexelovogipiw-rusipufebogul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461232/normal_603cb04259874.pdfIn PDF document text
    • https://jupagefux.weebly.com/uploads/1/3/1/3/131398252/gazenebidas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421627/normal_601c787d17c95.pdfIn PDF document text
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/bodafusi.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/83f7f8c0-6fb7-4b5a-94fb-1088e57a3739/54929894157.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/floral_border_design_templates.pdfIn PDF document text
    • http://woxikajir.myartsonline.com/xopivanimupevaletatujewa.pdfIn PDF document text
    • http://xologikaju.atwebpages.com/how_many_calories_in_a_bean_crunchwrap_supreme.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/modern_chemistry_textbook_answers_page_200.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/jiwojutud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee617558-1004-4073-b4fc-42cf39a03a9c/how_to_attach_the_upholstery_attachment_on_the_hoover_steamvac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f359cd1-4593-458a-a7c9-560b54d90e95/red_yellow_blue_balloon_arch.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/90497926694.pdfIn PDF document text
    • http://dufobirufo.atwebpages.com/zimukuzatulikuse.pdfIn PDF document text
    • http://xovolefewawex.atwebpages.com/jafadon.pdfIn PDF document text
    • http://gafodix.myartsonline.com/lapolodolulejuk.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_off0000fc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 5320 bytes
SHA-256: 5f68ad517711cae492fe52bdcb477ed6a246e4e6558a84edebf7f3a0f58daf1e
font_01_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 10804 bytes
SHA-256: a08273246219c2727a528b12f1cfb5073d0c86c2489f81f36d6c1879a38de4cb

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