Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83bec936f4cc219…

MALICIOUS

PDF

28.2 KB Created: 2020-04-14 17:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1ecfe8a6f1f96ae475863e8157f52cb9 SHA-1: f66ebd271ad08b9f194a6e514d6f4fa1678d6062 SHA-256: a83bec936f4cc2190ec3ffa1b91acbb92ca570a0f851b5dc18a652f976c194d3
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.

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://morethanjustaface.nl/uploads/1/3/0/4/130488662/130488662.html#brushability+sans+semi+bold+free
    • http://artismarnie.com/uploads/1/3/0/4/130488666/7cf734d34.pdf
    • http://muktishakti.com/uploads/1/3/0/6/130604348/romemuxirotoxu_lumeputijozozap.pdf
    • http://hillview.estate/uploads/1/3/0/6/130620972/da7d784b57257.pdf
    • http://hartfordheatingandcooling.com/uploads/1/3/0/2/130271224/5879002.pdf
    • http://dgrantassoc.com/uploads/1/3/0/8/130814106/8405035.pdf
    • http://facesoftheforgotten.com/uploads/1/3/1/3/131398529/6678720.pdf
    • http://kentuckycaricature.com/uploads/1/3/1/0/131069970/litadule.pdf
    • http://nomadic-chris.com/uploads/1/3/0/6/130603807/kafawurugules.pdf
    • http://herenduroadventure.com/uploads/1/3/0/5/130590140/d91722.pdf
    • http://bodyhairsolutions.com/uploads/1/3/1/4/131438062/0b86177a.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_off00004aad.bin
37844844e6c63a88bf05dc2932e56acf584758c01029a18da549b56acff289d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AAD 6620 bytes

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