Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bd6479a9a0d897…

MALICIOUS

PDF

102.1 KB Created: 2020-12-19 07:04:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8554759607dcc25c3881e8f538115a32 SHA-1: bff383a1640f637269ebd232ff38f0d17d3720fa SHA-256: 31bd6479a9a0d897db1110aef351f34c8e3d5294cca140210f20e7b6fd7a8b36
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or SEO manipulation tactic. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature, with ClamAV identifying it as a phishing trojan. The embedded URLs, such as 'https://traffset.ru/123?utm_term=simplex+4005+manual', are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=simplex+4005+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479214/normal_5fc7b939d468e.pdfIn PDF document text
    • https://roboxojepuz.weebly.com/uploads/1/3/4/2/134235986/metaputiv-pesafilitif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5fc04bd320479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447464/normal_5fb870eff35b2.pdfIn PDF document text
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/da4e28b03fa19.pdfIn PDF document text
    • https://lejomibis.weebly.com/uploads/1/3/4/6/134657815/nadinaso-tipibobipawarej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_5fd5f8f6cedf1.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/jixerubowi/ramomakoranefepegamugap.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/todiliwijiwonuvabul.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/zodozazulexupanoreka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/620612ba-77b3-4460-84ec-7fac4dcbbfeb/vagovenaxolajevajew.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/26368742886.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_off00015177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15177 5216 bytes
SHA-256: 30a3bcd428c6ba84fe647026fb4404415594224415702c193eb9c64323530587
font_01_sfnt_off00016333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16333 12132 bytes
SHA-256: d53a47649d2388caac46bd584ffc400ec15aea73914c1ab9d27d8b85a9a27260

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