Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ab5de447602ddf…

MALICIOUS

PDF

33.9 KB Created: 2020-05-15 08:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27a1dcbdaa3abb211f74554e077bbdf5 SHA-1: e11e0c562c06bb99b6224f2a5ba4bf5cb63abacd SHA-256: c7ab5de447602ddfc7f25bf45054593a6c9a3db320496b074bff23c58ea9227a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, includes a URL that appears to be the primary lure. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a network of linked resources, likely for further exploitation or content delivery.

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://cte.news/uploads/1/3/1/3/131379371/131379371.html#la+probl%25C3%25A9matique+de+l%2527+ad%25C3%25A9quation+formation%252F+emploi
    • http://pocketspleaser.net/uploads/1/3/0/7/130776132/doredubo.pdf
    • http://faloncreekfarm.com/uploads/1/3/0/3/130313170/fosogarafeje_wafunaxufalup.pdf
    • http://keriaskloset.com/uploads/1/3/1/1/131164524/3789473.pdf
    • http://foxvalleyponyclub.org/uploads/1/3/0/2/130289638/a2e520de5dc0b.pdf
    • http://darkersidesilver.com/uploads/1/3/0/5/130543346/nikusugiwesif.pdf
    • http://sugarlakerecreationalproperties.com/uploads/1/3/1/3/131380343/4882752.pdf
    • http://buckscountygolfacademy.com/uploads/1/3/0/3/130323405/desusufevulanikuzik.pdf
    • http://ellcoach.net/uploads/1/3/0/7/130740232/6368018.pdf
    • http://smgeatwellfeelgreatlookgreat.org/uploads/1/3/1/6/131636858/8703596.pdf
    • http://kissdis.com/uploads/1/3/0/4/130435682/rowupixi.pdf
    • http://redhawkfood.org/uploads/1/3/0/6/130620940/nezanikabiwoji.pdf
    • http://spanishnoemy.com/uploads/1/3/0/5/130551586/d5db9c.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_off00005542.bin
b4e93845f9db925ebf440d915b9bfb19caf35ad12cb0e4fc05ded8114ece4042		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5542 11216 bytes

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