Malicious PDF — malware analysis report

Static analysis result for SHA-256 625851a63775e5e9…

MALICIOUS

PDF

35.9 KB Created: 2020-06-18 13:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57f1ccefa150d2bf6baaf8b4c5aa0e19 SHA-1: 6e3a605959f6c4bf6fce0624927f3ce9f7b66aab SHA-256: 625851a63775e5e94d9b0e2e5617fe2fefe59d389025758f600c6df503004b1c
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on suspicious domains and appear to be part of a link farm designed to obscure the true malicious intent. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests a drive-by download or phishing attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

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://becdaxis.com/uploads/1/3/0/3/130313378/130313378.html#data+warehousing+interview+questions+with+answers
    • http://dp246.org/uploads/1/3/0/5/130545633/xaxagepex_pakijupudosi.pdf
    • http://virtualvalorpropertygroup.com/uploads/1/3/1/4/131438098/mewijefawi.pdf
    • http://thecleanglassco.net/uploads/1/3/1/4/131452804/1536581.pdf
    • http://diamondacp.com/uploads/1/3/0/5/130538994/3368458.pdf
    • http://ultimateaccountingservices.co.za/uploads/1/3/0/2/130270994/99f491cc869.pdf
    • http://kenglishllc.com/uploads/1/3/0/5/130551944/8672681.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005449.bin
28b8e979a9c2e6450d6ea67d06fa3150faae66254eb401a0660c4543bf394ce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5449 5072 bytes
font_01_sfnt_off0000659b.bin
eb18aa86fb6098bc3e02a3c5d9ddbddd7c3cd3ee6441b9b32f4dfed75406bdbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x659B 8816 bytes

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