Malicious PDF — malware analysis report

Static analysis result for SHA-256 897c8d7acc71166f…

MALICIOUS

PDF

75.3 KB Created: 2021-03-29 10:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c0e49f8c65c301647a5b0e05e7a14e04 SHA-1: 98c90f6d937365b308f147684581d506ab53aae4 SHA-256: 897c8d7acc71166ff9acaa9fb899a6fcd95a0c75bcbe5e65681b985baa94fcca
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm, which is a common technique for SEO manipulation and potentially distributing malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful sites.

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://golowaki.ru/wix?keyword=staying+fat+for+sarah+byrnes+chapter+2+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417030/normal_5ffd13dc6596f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375340/normal_6002ab2d8bba1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413226/normal_5fcb6389a469d.pdfIn PDF document text
    • https://rotaxavevun.weebly.com/uploads/1/3/4/8/134884867/rebuzulaturodasatamu.pdfIn PDF document text
    • http://yoptan.space/android_7._0_update_apky5fct.pdfIn PDF document text
    • https://wibotutez.weebly.com/uploads/1/3/4/0/134012840/kelukeju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423188/normal_605b55c88e181.pdfIn PDF document text
    • http://slamelina.website/android_9_para_zenfone_4_selfie8gket.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455642/normal_600f88d42cba7.pdfIn PDF document text
    • http://bred-enligne.com/gozisutoruh8gex.pdfIn PDF document text
    • http://mmmmmme.space/givukifosimipopofideg7gbex.pdfIn PDF document text
    • https://vujugorakiti.weebly.com/uploads/1/3/4/7/134719441/c727aae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_6019f0c112731.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368228/normal_5fef63f13bcac.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/wukevirenesu/share_chatting_apps.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/positive_effects_of_globalization.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/absalom_absalom_novel.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/16187759644.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/what_are_barriers_to_effective_communication.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_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 5876 bytes
SHA-256: 26265c39f5aa0b9c7e990ee50c7edb515498e572c0097da9a56233086daf0043
font_01_sfnt_off0000f9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EA 10644 bytes
SHA-256: 275c0f948901a32008c6a861a3d3e83892abb360fe1603275daa68278c4542ba

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