Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ce4d03a33f17c8…

MALICIOUS

PDF

76.8 KB Created: 2020-12-04 07:19:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2a7179bce23db9333f724601b552a02a SHA-1: 93c14516eb158b9319d28aa58446d6f422e3fe25 SHA-256: 54ce4d03a33f17c823d3bcd1e3be6001c0b9f8f0d51a65cde52c4e9d5717509a
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/aws?utm_term=informal+email+writing+topics+for+class+6 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5f8951da86416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f942aa49f4cc.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/7343167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501231/normal_5fbb80092e884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378383/normal_5f9557de9e0b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_5faeb2bea3fb8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/integers_worksheets_math_aids.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/14248325804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe21062-3aa7-4017-9f9d-f9b892c777fd/workflow_of_data_analysis_using_stat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f67aeb2-c5c6-42d5-9b8b-16991b9f99d9/beboraxofitubisiwusirela.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/30181086329.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE390 5304 bytes
SHA-256: 62b4176a833f24765471bf088a41cdde90d031323d2b31a96ac852b481131dd9
font_01_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 10220 bytes
SHA-256: 0ec07e5749c7fc74b49e10b411f0046d14283e79da633aa13a143ac211e47674
font_02_sfnt_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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