Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8aa385376b0620…

MALICIOUS

PDF

46.5 KB Created: 2020-04-04 14:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4c4a634b6485fb990285c4634a3e8f60 SHA-1: 6380c24d191689cbe042e5d833a84a439d2bfac6 SHA-256: 5f8aa385376b062041668041deea799ca54af5529f7fd6687dc96c24353a2b07
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by an ML classifier as malicious and contains a heuristic indicating a large number of external links, suggesting a link farm or phishing lure. The document body contains obfuscated text and multiple URLs that point to potentially malicious content. While no scripts were explicitly extracted, the structure and numerous external links strongly suggest an attempt to redirect users to malicious sites.

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://marythumma.com/uploads/1/3/0/5/130550813/130550813.html#the+everlasting+man+gk+chesterton
    • http://gveca.com/uploads/1/3/0/7/130739826/xemilufada_xisile.pdf
    • http://unitedwomenforchange.com/uploads/1/3/0/7/130775627/nakoxebezo.pdf
    • http://velefante.com/uploads/1/3/0/7/130740195/5020ef81f29.pdf
    • http://pressurewashingboyntonbeachco.com/uploads/1/3/0/5/130550972/lolegeg.pdf
    • http://casaservicesfinanciers.com/uploads/1/3/0/7/130776055/710913e06da6f4.pdf
    • http://cheetahbus.com/uploads/1/3/0/4/130436049/gofakebig-zesavedubavobid-mefewuri.pdf
    • http://luxberlin.com/uploads/1/3/0/8/130813896/2188160.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_off00008cc8.bin
8e716b0fda4b9f4d0d143a34384a0e8197ee3a20ea79cf013511302d24f1b111		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC8 8004 bytes

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