Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86733b2351d8afc…

MALICIOUS

PDF

33.8 KB Created: 2020-04-07 07:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2165e5c67407c0b56d70d8037e6c4fb1 SHA-1: 63348b813b12e40d638afff658f1dbd4d1469df6 SHA-256: b86733b2351d8afc89b194b07f2dc9f5d4338df0cef1b46f049f072510746efc
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO poisoning or to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious intent. No scripts were extracted from this sample, but the primary attack vector appears to be the embedded URLs.

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://finixmarketing.com/uploads/1/3/0/5/130538863/130538863.html#dell+powerconnect+2824+configuration
    • http://sansfrontierseurope.com/uploads/1/3/0/7/130775818/fututesakume_rizegewibojow_saripale_rujorix.pdf
    • http://aaronengland.org/uploads/1/3/0/9/130969475/1516217.pdf
    • http://antoniocav.net/uploads/1/3/0/7/130775607/afac280c.pdf
    • http://thesexemporium.com/uploads/1/3/0/7/130739567/eb8f187d1a.pdf
    • http://moffattspeechandfeeding.com/uploads/1/3/0/7/130738812/bobifemabat_tudarere_tigevi_paralodomovad.pdf
    • http://stevecarlglassart.com/uploads/1/3/0/5/130544672/zepopububizir_pitipowesumupej.pdf
    • http://knacky-knaves.com/uploads/1/3/0/6/130621190/716146.pdf
    • http://westsaclibfriends.org/uploads/1/3/0/8/130814531/xojug.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_off00005c19.bin
0ae92cc64a86cd84fb9cbec7e72840825f3a7e63d5cb8cfc17f898d06cd3b2bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C19 7988 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.