Malicious PDF — malware analysis report

Static analysis result for SHA-256 71212da630d21df2…

MALICIOUS

PDF

64.6 KB Created: 2020-11-20 08:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e7233a3379dff9c24292fad2bb6eda11 SHA-1: 9881a95a6d249613697efb35da271a5d9b97684f SHA-256: 71212da630d21df2eb17d22f1cbad39a80c827db03a71601eab583f1288fb436
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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=aggiornamento+android+samsung+s9 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453754/normal_5f9fc5219ebb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_5f9ca07ca7011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383917/normal_5f98ddd02b9cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450734/normal_5fadd7866008c.pdfIn PDF document text
    • https://fikugutadopoxas.weebly.com/uploads/1/3/4/3/134340330/fiwivor.pdfIn PDF document text
    • https://tizijepen.weebly.com/uploads/1/3/4/2/134234944/9e866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_5f8d9b1611229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_5fad70e73d456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375503/normal_5f8e240c6d45e.pdfIn PDF document text
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/xalevofisebaba_gesizafajuna.pdfIn PDF document text
    • https://xezinazilasiza.weebly.com/uploads/1/3/4/3/134319357/5606036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386605/normal_5f8cafc6727ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490934/normal_5fadc2ec9730c.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/juduk/97762038935.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_off0000c102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC102 5256 bytes
SHA-256: da3a3ba4c86d01d1799cddedc6131a6e3f7db1064c1ed234357e2f840c315b87
font_01_sfnt_off0000d2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C5 10740 bytes
SHA-256: e6a736d9710370d81bd0f579e7491b03dc489786dcb03c7452067ceb64a8694b

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