Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c725bf33c510ee…

MALICIOUS

PDF

48.7 KB Created: 2020-04-16 01:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 342afdfac922a2218e22a3af2cfffcf3 SHA-1: 44b9fa762b8736f5124484b2bd9411df024cc7a0 SHA-256: 37c725bf33c510ee46c79847b4f7f073db4f13f1953d1765153f575cdfc4afc2
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which are structured in a way that suggests a link farm for SEO purposes. The document body, though heavily obfuscated, contains text related to a 'customer complaint email template' and references the wkhtmltopdf tool, indicating a potential lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous suspicious URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://xocobean.com/uploads/1/3/0/7/130775971/130775971.html#customer+complaint+email+template
    • http://iescfl.com/uploads/1/3/0/6/130621388/8302021.pdf
    • http://southernbelleshimmer.com/uploads/1/3/0/9/130969335/kijelejikajo_pulofadada_lijug_biwipi.pdf
    • http://manorofthyme.com/uploads/1/3/0/4/130488530/tipumitujofowiwu.pdf
    • http://kilbarronmd.org/uploads/1/3/0/5/130550835/a8c34aae8.pdf
    • http://rscrystalmedicine.com/uploads/1/3/0/5/130588861/nipudafozanur-xefopuwusovo-kemojamareme.pdf
    • http://private-label.training/uploads/1/3/0/6/130603939/butewedoraro.pdf
    • http://jojoboom.com/uploads/1/3/1/3/131379956/bc53a.pdf
    • http://blobfishbooks.com/uploads/1/3/0/4/130435884/diwazi-wutulusi-sujolijawizo.pdf
    • http://microsoftecare.com/uploads/1/3/0/2/130287313/3763457.pdf
    • http://pammccorkindale.com/uploads/1/3/1/1/131163740/3569573.pdf
    • http://rscrystalmedicin
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000094c0.bin
1f060e0ec668dad0038edaf7f9aa37c0b873998ea81044f411bf12cb56b1fc12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94C0 8524 bytes

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