Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bde81df1f1b9c62…

MALICIOUS

PDF

70.4 KB Created: 2021-02-16 22:39:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9a7a089bab01788e34ff0bd6757ef639 SHA-1: dcb2e20e6ea57f7e4661146e99f73d1a8b81490f SHA-256: 9bde81df1f1b9c62aea4f42683b30156c28f1c945bfadf37a7c1abb55efa7645
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and CDN domains, indicative of a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially malicious or spam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=navarre+bible+old+testament+7+volume+set PDF link annotation
    • https://tofariviviri.weebly.com/uploads/1/3/4/1/134109347/c14a41d0.pdfIn PDF document text
    • https://lenopeseku.weebly.com/uploads/1/3/4/0/134040497/getesusamiboza_gonige_fasodegug.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/1Nhfifj/xiziwojomekorawadiseru.pdfIn PDF document text
    • https://cdn.sqhk.co/xipapotug/hgGbhgN/introduction_to_business_analytics_course_syllabus.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/hgfjjqA/water_physics_simulation_pro_package.pdfIn PDF document text
    • https://gazodajatara.weebly.com/uploads/1/3/2/7/132712558/vererak.pdfIn PDF document text
    • https://cdn.sqhk.co/gokarunedod/hiegfJr/photo_editor_collage_maker_pro_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/hCuellD/20082625173.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/PZfapjb/42891408968.pdfIn PDF document text
    • https://cdn.sqhk.co/misumirotoj/gijidii/my_little_baby_jaya_2017_sub_indo.pdfIn PDF document text
    • https://kaxagigunuji.weebly.com/uploads/1/3/1/3/131383746/bujuzik.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/gekojulog/wugosobokawexam.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/informe_amnistia_internacional_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/31478870298.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/fha_manual_underwriting_guidelines_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/4769871896.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_off0000d451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD451 5220 bytes
SHA-256: 697a0c96668975fc9d0becb73b7f71f03e323d0d26e42d042559eb0a7b9e4a99
font_01_sfnt_off0000e60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 11544 bytes
SHA-256: 1bd769025ec28148aaaf399e6cda10fc608e90c5e31240e44e30ffe796ee0070

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