Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab6ae80828e4d42…

MALICIOUS

PDF

76.3 KB Created: 2021-03-05 16:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 17b933b107a725573744b61468b972e3 SHA-1: f6d9537867509febab711d9ddf35179b17606431 SHA-256: fab6ae80828e4d42fccf4e9bcceeca943933f75fa1a57877696f0c3099cef034
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a search result for 'ap chemistry textbook answers', aiming to lure victims to a phishing site. ML classification and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded malicious URL suggest it's designed to lead users to a compromised site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/wix?keyword=ap+chemistry+textbook+answers In PDF document text
    • https://cdn.sqhk.co/buweworipoza/L4jeMgi/83966223308.pdfIn PDF document text
    • https://cdn.sqhk.co/mevexobuzur/jmJhbhf/newezalako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_600d0b06f322c.pdfIn PDF document text
    • https://gobodukigibab.weebly.com/uploads/1/3/1/8/131856162/6d1b22c3be52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388276/normal_5ff7b89c65559.pdfIn PDF document text
    • https://wonozonozosog.weebly.com/uploads/1/3/1/3/131398184/65cee064066.pdfIn PDF document text
    • https://vigagexagadip.weebly.com/uploads/1/3/1/8/131856194/zuririniroxu-pavegunup-gokexetepipap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418973/normal_60102c1e30a01.pdfIn PDF document text
    • https://levukuwaxumofet.weebly.com/uploads/1/3/1/3/131383949/988618001c.pdfIn PDF document text
    • https://gizajowi.weebly.com/uploads/1/3/4/3/134314542/bufofulovetogi_bixuvip_siralobubuwawob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_60217d6d5d743.pdfIn PDF document text
    • https://bikezurikol.weebly.com/uploads/1/3/4/6/134612173/953892.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443812/normal_5fc6bf0edaf1d.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/besafefaf/how_much_to_pay_for_graphic_design_work.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/us_army_officer_ranks_uniforms.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/kennebec_river_fly_fishing_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d52ac40-f8fd-446a-885b-a9ebe590a48f/weber_smokey_mountain_22.5_cooker_smoker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffcfd835-1c63-45d5-a8b5-6a33899b802a/zefuxizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8101da9e-1f02-4efa-9808-b8f6686b7c4b/74973716705.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/nobeseromas.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_off0000e5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AE 5596 bytes
SHA-256: 2a12dd8ec154c2c0991bc7b31447a7831ac1c2747b42271dbc77167408ce9e80
font_01_sfnt_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 12952 bytes
SHA-256: 6d5cd5094ba634e367c1d4d5d92dd92bdb2513fa8749886793c26a891f294d56

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