Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2666740a8cab89f…

MALICIOUS

PDF

66.6 KB Created: 2020-12-27 01:46:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 51372f94080d295bed163dfbc2c128d5 SHA-1: e3d0d158a82a08b63dce797da4a1f7b6b5b59ab0 SHA-256: e2666740a8cab89f84427f8aca5b8d1595708263ee67fbb2f222c8710a38c8b1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 link farm, which is a common technique for SEO manipulation or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs suggests the primary attack pattern involves redirecting the user to potentially harmful websites.

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://trafficel.ru/wb?keyword=juicy%20fruit%20lyrics%20the%20vamps PDF link annotation
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/1158837.pdfIn PDF document text
    • https://kelobutino.weebly.com/uploads/1/3/0/9/130969458/6858734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_5fa33a46c95d7.pdfIn PDF document text
    • https://jamisovuropasag.weebly.com/uploads/1/3/4/3/134396730/8182229.pdfIn PDF document text
    • https://sasofisapen.weebly.com/uploads/1/3/4/5/134590640/f5fec0.pdfIn PDF document text
    • https://doritader.weebly.com/uploads/1/3/4/8/134885844/kilenapenu_zijuwotakonod_bodikokilokesel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_5f9cc63f43347.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/11750808-9e93-4bbc-9318-22bc71840c45/2015_ap_calculus_bc_free_response_student_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/fivebi.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/muvosuwoxaxixe.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/balu_video_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/p_f_t_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/danilawuzajowadajedebidez.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_off0000ca26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA26 5404 bytes
SHA-256: f49457a737ddbe5ffe8607d5e09a4e8e07313bb7ba6f91f71b5c3f0b5ab5603d
font_01_sfnt_off0000dc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6F 9372 bytes
SHA-256: e4eb6d4fffac1d789a46919df2bc4bef2a77eac190c5f909f4bfecd30662b612

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