Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd54c9a23f0a450…

MALICIOUS

PDF

54.5 KB Created: 2020-04-09 09:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f2d4d601c90a27825871dbcdb302f40f SHA-1: 84104bb2a5cd2edc65d24b3b79c8ef45912133d8 SHA-256: 4bd54c9a23f0a450b615d7668e6657624c08673567c9f80ae75f13afe1863c34
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was heavily obfuscated, but the presence of numerous external links is the primary indicator of malicious activity.

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://theglamstop.com/uploads/1/3/0/4/130483295/130483295.html#metodo+de+grupo+en+trabajo+social+pdf
    • http://stephenho.org/uploads/1/3/0/9/130969072/6105227.pdf
    • http://chiclen.com/uploads/1/3/0/6/130604411/kijuruwisuxili.pdf
    • http://heilalagarcia.com/uploads/1/3/0/4/130489247/e6125a4aa1c69.pdf
    • http://virtualpowerplants.co/uploads/1/3/1/3/131379749/6873230.pdf
    • http://ajochinger.com/uploads/1/3/0/7/130775604/pekezugusamosomege.pdf
    • http://ergo-dental.com/uploads/1/3/0/5/130541745/tagazefodur.pdf
    • http://101bamboofins.com/uploads/1/3/0/6/130604144/a212395b.pdf
    • http://livebeyondepic.com/uploads/1/3/0/7/130740292/8270878.pdf
    • http://greenoakbaptistchurch.org/uploads/1/3/0/6/130605422/68ec218d5.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_off0000abc1.bin
623fed957dd169b265b224bd38d45a607be0953d88314cd87cccd8fd7b197684		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABC1 8756 bytes

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