Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d57dad53554e53…

MALICIOUS

PDF

125.1 KB Created: 2021-03-11 14:49:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: dad6b6de68e44bf3fdaf990b465cba67 SHA-1: 3960aeea327e8f72a1bf8d36bd39ddc212cd7f57 SHA-256: 40d57dad53554e53a1a3ed780b15475ff8da517b9ba2d5ff7488ab096911d851
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links to potentially disposable hosting services reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/award?keyword=makalah+tentang+amandemen+undang+undang+dasar+1945+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387817/normal_5fd2ad4127e45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479222/normal_5fe898adcbac3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385422/normal_5fc7eb5a2530c.pdfIn PDF document text
    • http://copyrightproblem.com/asma_bronquial_pediatria_2018jwrks.pdfIn PDF document text
    • http://sfr-webmail.com/78652010562f01so.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390097/normal_5fe0918eb69f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452217/normal_5feddfd8ae03c.pdfIn PDF document text
    • http://mangalvpodarok.ru/pituwegofolefesoforrade8.pdfIn PDF document text
    • http://tourist.fish/benefipibasidesusiptk5i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387410/normal_601bd2e9505f8.pdfIn PDF document text
    • http://fortuneo-enligne.com/13957396210l34j1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393208/normal_5ff0624b326b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451210/normal_6034f5d161480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418972/normal_5ffcd72bc8ac0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376372/normal_5fd241123548d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454807/normal_5fed412230d98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417025/normal_6027408b06877.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_6af8fc8b08a84722bcbe816e51337345.pdf?index=trueIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_a2be78b21d3e452ba394e1708024b234.pdf?index=trueIn PDF document text
    • http://nutogexutal.rf.gd/73658248709.pdfIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_af4de275dd8949218579f8f8d2021c25.pdf?index=trueIn PDF document text
    • http://busikuf.rf.gd/honduras_safety_report.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_off0001ae6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE6D 5944 bytes
SHA-256: 10feecdcefadc94c3f45ee2e4afa484b42f6f3be026b45dec977965dbef13f1b
font_01_sfnt_off0001c297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C297 10212 bytes
SHA-256: a386c031f8aed61676240b0eeebac9e64f5de7f73172fd79c8ac52978538159d

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