Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb36fb031d42cbf1…

MALICIOUS

PDF

40.4 KB Created: 2020-05-30 23:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 220f1880621caf2b7b764ef28e480b4a SHA-1: 8598944b1d2ab9816ebd3222001e68cb83987966 SHA-256: cb36fb031d42cbf1669bf78f6025438d924f20650d7ba8190148aa59303a3897
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier as malicious. It contains a significant number of external links, many of which point to domains that appear to be part of a link farm or SEO spam operation. The presence of numerous PDF links suggests an attempt to distribute further malicious content or engage in phishing activities. No scripts were extracted from this sample, limiting the analysis of specific execution behaviors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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://perapalace2018placeholder.devsite-1.com/uploads/1/3/0/6/130621426/130621426.html#texto+period%25C3%25ADstico+ejemplo
    • http://twenty5ive8ight.com/uploads/1/3/0/2/130289158/minudopetop.pdf
    • http://ohsnappartyphotobooth.com/uploads/1/3/0/6/130604300/guvuneponumawidiva.pdf
    • http://homehealthandsustainability.org/uploads/1/3/0/5/130541073/wasikezemet_kitubof_jimafipurevevi_rupawove.pdf
    • http://mail.abundanceandyou.com/uploads/1/3/0/6/130639642/fememisojinasum.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_off000070af.bin
bf5a721ad2c5629714ad3850356315b44c2651151e6fa66936362975b88d6116		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70AF 11368 bytes

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