Malicious PDF — malware analysis report

Static analysis result for SHA-256 d375686143bca811…

MALICIOUS

PDF

83.3 KB Created: 2021-02-05 11:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 82348d9ca213f9f10bc3fb742fe3549d SHA-1: c9bd66503e9d1f625a83d550da2929dbcd3d3fc0 SHA-256: d375686143bca8119f43bd715f95de5e371f512b77b1641dfda8746414baa296
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous external links, many of which point to PDF files on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO manipulation tactic. The embedded URL 'https://jacksth.ru/aws?utm_term=chronic+pain+management+guidelines+2015' is likely a lure to engage the user. While no scripts were explicitly extracted, the nature of the links and the PDF format suggest potential for embedded JavaScript or other exploits.

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://jacksth.ru/aws?utm_term=chronic+pain+management+guidelines+2015 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419836/normal_601410cc214b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382413/normal_6002574320b6c.pdfIn PDF document text
    • https://muverepifakapi.weebly.com/uploads/1/3/5/3/135387058/dalirewomudam.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/zusotixovasubilaqixp2.pdfIn PDF document text
    • https://zoxujaratufopa.weebly.com/uploads/1/3/5/3/135399722/8984479.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408595/normal_5fe35892369bc.pdfIn PDF document text
    • https://ginuwawabesinu.weebly.com/uploads/1/3/1/1/131164414/3735506.pdfIn PDF document text
    • http://savadaqwe.space/demonstrative_pronouns_worksheet_spanishfpqjk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487413/normal_60047fe653302.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404310/normal_5ffcb32fb29e8.pdfIn PDF document text
    • http://hydra.moscow/vokudaviwejogotateguwavob4h2.pdfIn PDF document text
    • https://jadafuvirop.weebly.com/uploads/1/3/2/7/132710722/8489587.pdfIn PDF document text
    • http://prizinsta.site/wire_size_calculator_necdmhvy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 5840 bytes
SHA-256: 8b3aec911388ab939861a34ae4492d0177b85be08dd5efd3e176fa6cd8158a6d
font_01_sfnt_off00011b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 10768 bytes
SHA-256: 683024e0ae25a58153dcccd89f08af75fe0cd2dc45075b243162d100f7729526

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