Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87b0de52fcb1b72…

MALICIOUS

PDF

69.9 KB Created: 2020-11-21 07:18:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f746d3b7cb8ce9f7d419df583fa7cd83 SHA-1: 76eaaf807df4e4340be9eabb37c6315cb70d5319 SHA-256: f87b0de52fcb1b72a6becc3a1c73aaa80683f07e9a4798fd16485524cd70b030
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or SEO spam campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

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://traffset.ru/aws?utm_term=downy+dryer+sheets+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5f870c851be09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445129/normal_5fa873b9bed52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_5f9d3627dce9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_5f92402216052.pdfIn PDF document text
    • https://savakorudefipe.weebly.com/uploads/1/3/2/3/132303238/jijugude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459162/normal_5fa68823dfd4c.pdfIn PDF document text
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/5cb9207cb.pdfIn PDF document text
    • https://lifesodoxeduze.weebly.com/uploads/1/3/4/3/134372712/jewipuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408584/normal_5f9c4aedeb0e2.pdfIn PDF document text
    • https://widufosonetorif.weebly.com/uploads/1/3/4/5/134598319/af61907a9928.pdfIn PDF document text
    • https://jatokogeredere.weebly.com/uploads/1/3/3/9/133997843/7905421.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/ditiruz/jisokalikufi.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/26373749384.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/legal_transcription_jobs_from_home_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/free_contraction_worksheets_for_5th_grade.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_off0000d64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64B 4924 bytes
SHA-256: d41636a59c83a7205f23ff897dd7db01bbc08d644cf280d949f3e285c84e541a
font_01_sfnt_off0000e72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72A 10436 bytes
SHA-256: 4baf392ec17baace57d30d12053125d6f124134df4975d27fffc96d3c222e931

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