Malicious PDF — malware analysis report

Static analysis result for SHA-256 794bc4f249c8bdce…

MALICIOUS

PDF

46.6 KB Created: 2020-06-05 20:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 7fbb9185f6717e6179114fdcc9cce8e9 SHA-1: 426f826f963863fe0942b18761ba14a07820b0cc SHA-256: 794bc4f249c8bdce0274f19f0f306b3ced81ce88aa1d72efd9f001b636e072d9
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO poisoning attack. The ML classifier also strongly indicated maliciousness. The embedded URLs are likely used to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://1l5.undesirable.us/uploads/1/3/0/9/130969751/130969751.html#contr%25C3%25B4le+de+lecture+les+mis%25C3%25A9rables+4 PDF link annotation
    • http://christophercameronstudios.com/uploads/1/3/0/2/130288722/fijidiliful.pdfIn PDF document text
    • http://sewingtheseeds.net/uploads/1/3/1/6/131606241/bofexutesilanem.pdfIn PDF document text
    • http://giftguyde.com/uploads/1/3/1/6/131637830/gesilabanej.pdfIn PDF document text
    • http://mgrsti5539j.seamlesstech.biz/uploads/1/3/0/2/130271068/gigijomaj.pdfIn PDF document text
    • http://hopeforhispaniola.com/uploads/1/3/0/9/130969627/ruxixopex.pdfIn PDF document text
    • http://bbqlowell.net/uploads/1/3/0/4/130435556/galegemodev-patadurud-fokefom.pdfIn PDF document text
    • http://rivendellgoldens.com/uploads/1/3/2/3/132302921/zoboj_gitetiporetekek_fomefotalik.pdfIn PDF document text
    • http://mail.arcmowercounty.org/uploads/1/3/0/7/130776611/pidegakapozafavatobe.pdfIn PDF document text
    • http://1l5.undesirable.us/uploads/1/3/0/9/130969751/terms.htmlIn PDF document text
    • http://1l5.undesirable.us/uploads/1/3/0/9/130969751/dmca.htmlIn PDF document text
    • http://1l5.undesirable.us/uploads/1/3/0/9/130969751/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jesebenoj.files.wordpress.com/2020/06/44494946467.pdfIn PDF document text
    • https://xixajod865448635.files.wordpress.com/2020/06/52412628945.pdfIn PDF document text
    • https://befevimupa.files.wordpress.com/2020/06/xamerasiseno.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86A5 12128 bytes
SHA-256: ee829c251b0bf469d843cadf74ed0828e390bc2a6bc8bd64b1562a18e0082f1f