Malicious PDF — malware analysis report

Static analysis result for SHA-256 5063fb3856255cc5…

MALICIOUS

PDF

82.3 KB Created: 2021-04-13 16:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 23b9b6f0083cc0e11ed5865dbb9b814b SHA-1: 794b8b0efb4643456212c01ceb691808c698831c SHA-256: 5063fb3856255cc51ee84f1b10d2f88abd5a2facef23faef6507d95b5dfc6294
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=the+weary+blues+tone+and+mood PDF link annotation
    • http://baugroup.info/dizziness_remedies_at_homeii93s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453718/normal_604862673143f.pdfIn PDF document text
    • http://organicnu.info/nvidia_quadro_p600_spec_sheetqv4rl.pdfIn PDF document text
    • http://toportt.online/12640761730u0b1d.pdfIn PDF document text
    • https://xotogifove.weebly.com/uploads/1/3/1/4/131406695/tisutavopivuk.pdfIn PDF document text
    • http://austritkfa.com/87492976446mzjqi.pdfIn PDF document text
    • https://jipafopabos.weebly.com/uploads/1/3/3/9/133986828/pedenapilurom_vinoruxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_60146aceab70a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379618/normal_60019cccf1ee3.pdfIn PDF document text
    • http://everydayy.fun/xikedev2t9h.pdfIn PDF document text
    • http://it50save.info/nintendo_wii_console_for_sale_ukvqv32.pdfIn PDF document text
    • http://sodahub.pro/nogewuxesirilint97s.pdfIn PDF document text
    • http://carluxepaint.site/9604013856f6aft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470537/normal_602ac46792ff7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392864/normal_5fdbd49766191.pdfIn PDF document text
    • https://fusidaxeda.weebly.com/uploads/1/3/1/4/131453850/7191597c28e75aa.pdfIn PDF document text
    • https://fojaxusulilunud.weebly.com/uploads/1/3/1/3/131381134/baf9d94d58.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_e9bc1e4ebb9540169dc13abc5231a805.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_0045738189b844a7b6d177f0bc73939c.pdf?index=trueIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_5a983fc425514cefb7b8492156d7a9b1.pdf?index=trueIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_85bb10b9118445ff90b4639118aa6f58.pdf?index=trueIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_71b14cbe1cf9408394e9a31634ffaa5a.pdf?index=trueIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_335f5a9343914d998b21da1e58653437.pdf?index=trueIn 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_off00010547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10547 5348 bytes
SHA-256: d61e8e7f2579fd5a5921205e88b18ac6bbaecd440ba0face4ca853213fde461e
font_01_sfnt_off0001175d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 10676 bytes
SHA-256: 3ba95778b72caa5e545ccf07ba5d17848a481a6b183930eda4b88b5a31a3a82e

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