Malicious PDF — malware analysis report

Static analysis result for SHA-256 7097e1789cec1cce…

MALICIOUS

PDF

41.2 KB Created: 2020-03-20 04:04:02 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 77c4c2a87d255aa0a01f23e74cc9f273 SHA-1: 4542f29cfa2a9a09ef32646e36413f21949a0260 SHA-256: 7097e1789cec1ccec4a420ef955278a0d1d44f43630c727e7fbd6a19ea189028
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to PDF files hosted on various domains. The ML classifier strongly indicated maliciousness, and the embedded URLs suggest a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate an attempt to direct the user to potentially malicious content.

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://ccl-nyc.com/uploads/1/3/0/6/130605124/130605124.html#clasificacion+de+test+fisicos
    • http://manticarchitecture.com/uploads/1/3/0/2/130272484/9655729.pdf
    • http://www.steelconsultingservices.com/uploads/1/3/0/5/130544954/wutevezur_morulogubelufed_fuxonifi_kokujikewasaw.pdf
    • http://www.wayoffsides.com/uploads/1/3/0/4/130493816/babuvuri.pdf
    • http://chopnmix.com/uploads/1/3/1/0/131070441/2488924.pdf
    • http://www.thetattoowife.com/uploads/1/3/0/2/130288731/9d74f9eb7186bdb.pdf
    • http://8-5mobile.com/uploads/1/3/0/2/130288552/936782.pdf
    • http://www.barnhartrestoration.com/uploads/1/3/0/8/130874222/8880627.pdf
    • http://hostmaster.mayahypnotherapy.com/uploads/1/3/0/5/130588475/jivowikuzurakefo.pdf
    • http://truelightnj.com/uploads/1/3/0/4/130483864/pukifotozamadoj-newaxejibuzutib-dunobasokod.pdf
    • http://tshmfoundation.org/uploads/1/3/0/4/130483981/bokoboxakenafuwox.pdf
    • http://www.theartplayground.org/uploads/1/3/0/5/130590582/8015419.pdf
    • 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_off000076a7.bin
e4d66803ce59e80f968d21fa2ec1f0137df31bf956ef0d762a2eee4c3e1c0777		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A7 8832 bytes

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