Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5dce780ccc82437…

MALICIOUS

PDF

28.8 KB Created: 2020-04-07 13:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 29727384bd6579cd87b6a7e8db4d6e14 SHA-1: 19323ba306b6ae47cd6d39a62117808c7ae558d9 SHA-256: b5dce780ccc82437e88aaead80f19c7335ff2db4ed7e6e38235a251c9cd8147a
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, many of which point to other PDF files hosted on various domains, indicating a link farm or distribution network. The document body contains garbled text but includes the URL http://southfloridafarmers.com/uploads/1/3/1/4/131482957/131482957.html#yakima+king+joe+pro+2, which is also present in the heuristics. The primary function appears to be directing users to a network of potentially malicious or SEO-abused content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://southfloridafarmers.com/uploads/1/3/1/4/131482957/131482957.html#yakima+king+joe+pro+2
    • http://dalecullis.com/uploads/1/3/0/3/130313140/7692189.pdf
    • http://newnatureinc.com/uploads/1/3/0/4/130483566/7246254.pdf
    • http://thebeautyandbrows.com/uploads/1/3/0/7/130776841/vakajalaji_lutudoban_roxedabarilija_nuzilawiwebu.pdf
    • http://bigtimewoodandfire.com/uploads/1/3/0/4/130490561/6219674.pdf
    • http://davisonbusinessservices.org/uploads/1/3/0/5/130551192/kubofanito_gusikametasi_bufumo.pdf
    • http://olivialeestogner.com/uploads/1/3/0/7/130775366/jaluwo.pdf
    • http://livingthecreativelifestyle.com/uploads/1/3/0/6/130620510/xunikoxa.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_off00004a91.bin
a6f25bf6f447422d85531d0cc7385bbb2e106837a4e37529de94c5371ec6aa31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A91 6796 bytes

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