Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14bdadd509d2b3a…

MALICIOUS

PDF

37.3 KB Created: 2020-06-24 03:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 7f7fd5a344dc04e2335ad773ee93a45a SHA-1: 528a9599314525fcb9ca3f764062fba0b6bbb2b4 SHA-256: c14bdadd509d2b3a1ce9fae082d539a77d6d0d5973bf37ceb5bcfd9f23a56ed3
96 Risk Score

Malware Insights

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

The PDF document was identified as malicious by an ML classifier and contains a large number of embedded external links, indicative of a link farm or redirection scheme. The heuristic 'PDF_SEO_LINK_FARM' specifically flags the presence of numerous external PDF links, suggesting an attempt to distribute or host malicious content across multiple domains. While no scripts were directly extracted, the structure and heuristics point towards an attack pattern focused on luring users to external, potentially compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://juneraymond.com/uploads/1/3/0/6/130604039/130604039.html#6+kalma+pdf PDF link annotation
    • http://temchurch.com/uploads/1/3/0/3/130313178/bosumaremubu_bipeb_nopuvosa.pdfIn PDF document text
    • http://smileytolson.net/uploads/1/3/1/3/131380447/7459170.pdfIn PDF document text
    • http://bloomsrestonwedding.com/uploads/1/3/1/4/131407312/fewumazidagubo.pdfIn PDF document text
    • http://theartofjuliette.com/uploads/1/3/0/7/130740092/5844e1cc8879.pdfIn PDF document text
    • http://bleischlaw.com/uploads/1/3/0/8/130814680/8446f0.pdfIn PDF document text
    • http://medievalmedicinals.com/uploads/1/3/1/1/131163540/9933456.pdfIn PDF document text
    • http://zioneducatedheart.com/uploads/1/3/2/3/132302896/mojunajifo.pdfIn PDF document text
    • http://37h.undesirable.us/uploads/1/3/0/4/130436154/3798975.pdfIn PDF document text
    • http://div-pro.com/uploads/1/3/0/4/130479513/361066799ecf930.pdfIn PDF document text
    • http://cpanel.franknappi.com/uploads/1/3/1/0/131070527/7207092.pdfIn PDF document text
    • http://mail.championssportstravel.com/uploads/1/3/1/4/131437369/noveginozufun_jenesetimu.pdfIn PDF document text
    • http://general1948.com/uploads/1/3/1/3/131383383/1453577.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_off00005831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5831 4364 bytes
SHA-256: 00246c922feb7dc4117aaf777b4ded60a49e2e66fa4626868cd7337b08fa5df7
font_01_sfnt_off000066fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66FC 10124 bytes
SHA-256: 3a34f688d3a748f774a576f486afc682a7adc9ba104cab6b8baac0fd2e377d83