Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e6e43557037a1d…

MALICIOUS

PDF

44.1 KB Created: 2020-06-12 05:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: be36f1214e96a0bf64c182811219867e SHA-1: b0508c985b40a4557617ab4ee145912f1f3bcc87 SHA-256: 88e6e43557037a1dc4a4009325d498c58a67d4eea416ebb645442bf92b5861e7
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a link farm or redirection scheme, potentially leading to malicious content or phishing pages. No scripts were extracted, but the structure and heuristics indicate a malicious intent to direct users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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 http://syndicatesolutions.ca/uploads/1/3/1/3/131380885/131380885.html#american+history+answers PDF link annotation
    • http://nataliamonteagudo.com/uploads/1/3/0/5/130543353/belot.pdfIn PDF document text
    • http://alextdesign.com/uploads/1/3/1/4/131407263/1171768.pdfIn PDF document text
    • http://mail.spbcmemphis.org/uploads/1/3/1/3/131383352/5594857.pdfIn PDF document text
    • http://starttechdigitalmarketing.com/uploads/1/3/0/8/130874432/fdc91c57e4.pdfIn PDF document text
    • http://wrebs.com/uploads/1/3/0/5/130542922/8774498.pdfIn PDF document text
    • http://meatballsports.us/uploads/1/3/0/3/130323996/zonajizuzikeduj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lafesus.files.wordpress.com/2020/06/mixexuvazo.pdfIn PDF document text
    • https://namerixug.files.wordpress.com/2020/06/wegijoleraleruromutedez.pdfIn PDF document text
    • https://desomelub.files.wordpress.com/2020/06/sajovezejufiralidogufo.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000805c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x805C 11060 bytes
SHA-256: c5c8fd613ca89c206a80a2464e08f29d6d397d828e2214678634193f69f8951c

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