Malicious PDF — malware analysis report

Static analysis result for SHA-256 455151de2ddfd0f5…

MALICIOUS

PDF

74.9 KB Created: 2021-04-08 06:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ddc9117466544c2ab8b3dd8d83949379 SHA-1: 9099b7efe31a3dac695cd9dcdb2e00b9fab3de75 SHA-256: 455151de2ddfd0f597dfabbd9830a38c2c56959d58d49c275a5e7105f6eabda2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The presence of a large number of external links suggests a link farm or phishing attempt. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/123?utm_term=bekaboo+web+series++free PDF link annotation
    • http://ruvinowuge.scienceontheweb.net/change_management_steps.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/descargar_numeros_romanos_del_1_al_5000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488809/normal_603eb49417929.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/94243225097.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407066/normal_600167651d999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453734/normal_602a9ed632dea.pdfIn PDF document text
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/814058852068d.pdfIn PDF document text
    • http://sidufapas.mywebcommunity.org/pdf_converter_to_word_ipad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450156/normal_606e20959db58.pdfIn PDF document text
    • https://munerojepoges.weebly.com/uploads/1/3/4/0/134042508/xafoz_bolevovamu_sabukimipusox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_6044d3b1a171b.pdfIn PDF document text
    • http://sutiboju.sportsontheweb.net/4426258617.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/dumanajijawepesi.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/56831959380.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/50051887140.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_a6370ee0c47946b2a3c4be6c16666c91.pdf?index=trueIn PDF document text
    • https://a1bd7baf-2de3-4c81-8914-4b74a732ecf9.filesusr.com/ugd/c89f15_15eca4e686a94d8d8b481b7089d74228.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/biblia_ortodoxa_etiope_en_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/bolero_of_fire_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/3559344778.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_off0000e9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D1 5072 bytes
SHA-256: 49932943708e0dbec9bae5c3fc926ce6c28a20374478af1f1755858c89f4278e
font_01_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 10504 bytes
SHA-256: 8555a77649c3e782937d21774fc53f1a51b4846b8dd3659a67ffc94ad779de2c

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