Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fed04c309776256…

MALICIOUS

PDF

33.4 KB Created: 2020-04-04 11:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b6cae9a384f598ecb9defe517d344c29 SHA-1: 5d97618afb41f2f2277d0df5604a3e537a70f365 SHA-256: 0fed04c3097762567f8f3ad09920ac6a29f50ae0de4f01382668f1b054e75dd3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML_NYX_PDF_MALICIOUS classifier also strongly flagged this file. The embedded document body text, while partially garbled, contains URLs that are part of this link farm, suggesting a coordinated effort to distribute content or manipulate search results.

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://acaciaroadventures.com/uploads/1/3/0/3/130379674/130379674.html#numeros+del+1+al+100+para+colorear
    • http://budgetrollershutters.net/uploads/1/3/1/3/131382092/retoriwozexo.pdf
    • http://2425york.com/uploads/1/3/0/2/130288483/dazodad.pdf
    • http://leadershipandgrowth.net/uploads/1/3/0/6/130620353/9372003.pdf
    • http://brendalydesign.com/uploads/1/3/0/7/130739964/5d87c.pdf
    • http://onboardxpress.com/uploads/1/3/0/4/130476502/wamuwimobi-zijugimukafa-kowusawuw.pdf
    • http://thehvbs.com/uploads/1/3/0/7/130776594/352646.pdf
    • http://sexzinlace.com/uploads/1/3/0/3/130379192/7695964.pdf
    • http://targakova-toronto.com/uploads/1/3/0/6/130605010/lulawuzegazo.pdf
    • http://wildearthadventures.com/uploads/1/3/0/8/130873786/5886948.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_off00005582.bin
9d8a8d97327d51adb5dcd082e3c94b41dac8e41d484d834c66a06c0031fd3bd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5582 9404 bytes

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