Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a75956aee45572…

MALICIOUS

PDF

67.1 KB Created: 2020-11-21 03:17:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e20f0e617a2acbde9c023e86491df2f0 SHA-1: eb2faee29a2c91e21627162f4a6a2d48f9560414 SHA-256: c2a75956aee4557235c19978db0d3c73813f632f9664caacb4e6eeca1ba205c7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm and hosts external URIs, with one primary URL being flagged as suspicious. The document body, though heavily obfuscated, appears to reference 'Dnd 5e initiative tracker pdf', suggesting a lure to a malicious site. The presence of external links and the ML classifier's high confidence score point towards a phishing or malware distribution attempt.

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/123?utm_term=dnd+5e+initiative+tracker+pdf PDF link annotation
    • https://figovuliwa.weebly.com/uploads/1/3/4/4/134476313/e7760.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/6b795d0b3cee4f4.pdfIn PDF document text
    • https://pupedabakonarow.weebly.com/uploads/1/3/4/7/134709410/9208072.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/zonebon/the_book_of_jasher_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddaddbba-8848-45da-82b1-8ae45ffe78ed/nizorixixi.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/43268296055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/742373db-99e2-4f6e-afdd-dc1daf07f0e4/3990634348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17a53477-43a1-48d6-9066-6791978c7d9a/59860546820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/780d07dd-7b0b-406a-9341-c0bd8c61727e/introductory_complex_analysis_silverman_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6fa1842-a251-48dd-9ee8-b502cd9446ec/2667266954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40540b20-5bc9-4941-bd31-e85d3c1ce279/jurabipasegemesofilojare.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_off0000c8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C0 5184 bytes
SHA-256: 8029bda7752528d17375a25e768b102e0aad2fadcd0a20b63434ab93eae57299
font_01_sfnt_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 10872 bytes
SHA-256: bb9fa8a282387bd3acdadf7b3846f53e589e272071f30e13a48737cd11b89e3a

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