Malicious PDF — malware analysis report

Static analysis result for SHA-256 92141e2a1d06aaec…

MALICIOUS

PDF

69.9 KB Created: 2021-05-09 21:40:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1c14909078dd261646472af0a61e517a SHA-1: b7857f68c9f8baae974aebdb94bf1f61a057d3c5 SHA-256: 92141e2a1d06aaec051e98c7055415b9d8b71c04bd01b68909771b94bbdeb546
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious 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 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://jacksth.ru/strik?utm_term=the+rock+climbers+training+manual+anderson PDF link annotation
    • http://gulakami.22web.org/58989764095.pdfIn PDF document text
    • http://beremoter.online/kofirafapifp1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489979/normal_6009ecf2b6c89.pdfIn PDF document text
    • http://dexofuzexolan.22web.org/tom_clancys_the_division_2_parent_review.pdfIn PDF document text
    • http://timelessdecorum.com/bewesuxuwigesevejebolammqpoa.pdfIn PDF document text
    • http://ramavevukomiw.iblogger.org/21792876305.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/pigumuzivitateboruweve.pdfIn PDF document text
    • http://tugrull.com/defowadabakekavosnirac.pdfIn PDF document text
    • http://nibelv.xyz/lofisulowuz7m79t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370746/normal_5fcf0448cb87a.pdfIn PDF document text
    • http://ketoxitigojaluk.sportsontheweb.net/behaviorism_theory_in_education.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/talanufidijatorewig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://telawusufolij.epizy.com/alcohol_detoxification_guidelines.pdfIn PDF document text
    • http://ruxuwidoke.epizy.com/kubota_l3010_owners_manual_download.pdfIn PDF document text
    • http://jebufatibakuv.epizy.com/chuyn_sang_hnh_nh_online.pdfIn PDF document text
    • http://zinizebaki.epizy.com/cfa_level_1_curriculum_changes.pdfIn PDF document text
    • http://dadewom.epizy.com/33313947579.pdfIn PDF document text
    • http://xotaferuju.myartsonline.com/les_alphas_lecture.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_off0000d10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10F 5504 bytes
SHA-256: 5b753e5d69c7d066b7f6e400832b347358da04562ff45ea740f7c04bdedb97e5
font_01_sfnt_off0000e38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38F 11100 bytes
SHA-256: 5a243b1882c739e625082ab584d9db00a46707cd6350f676de652dae47a82e5a

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