Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ed47091bfe2c7d…

MALICIOUS

PDF

76.7 KB Created: 2021-01-03 22:27:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 77725dc2792b48eb6bb1efbb7c5a7c97 SHA-1: 971da198df1aad6c6236fd98a151fdeacbe10c72 SHA-256: e6ed47091bfe2c7d471f88470eada617b5c2f4b7dfe89f16fd59fe7f1dd63674
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. This suggests an attempt to manipulate search engine results or direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=remind+me+lyrics+eminem PDF link annotation
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/jemozo-tubud.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/a41ce0d2022.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/tiduro/25406614328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3419fdb2-8001-4648-9a89-8623803cb230/95172348216.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/34434597766.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/audio_cutter_and_joiner_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/babulal_nagarmal_satnalika_foundation_scholarship_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/add_and_subtract_polynomials_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/company_earnings_reports_today.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/banejikunuzeme.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_off0000df79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 4984 bytes
SHA-256: c7bb428c5e8a9da625b648e36a121161b01c4da118b0d29f0cd33240f3dcfdb9
font_01_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 4312 bytes
SHA-256: ab39e8748a57b55a7f2359cf6afd3d0983f92fb2442818417d3f62463b8ee751
font_02_sfnt_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 11052 bytes
SHA-256: c84c5cb17cfbd7b0f0d42a933896e4e260a4e7c98ae0363b1279ebf5410fbea7

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