Malicious PDF — malware analysis report

Static analysis result for SHA-256 9933ae3edcad30b1…

MALICIOUS

PDF

49.2 KB Created: 2020-04-03 21:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d0466956e67f6c389ecb24294fa8b701 SHA-1: eb74e4e769c04d0ad4cae038f77607ddda68a58f SHA-256: 9933ae3edcad30b1a051ce984cdbd1084d8b3943286b1a8ff7cba41c6e919ef1
94 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links to various domains, identified by the PDF_SEO_LINK_FARM heuristic. These links point to other PDF files, suggesting a link farm or a distribution mechanism. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to a network of external resources rather than delivering a direct payload within this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zephyrhome.com/uploads/1/3/0/7/130776257/130776257.html#australian+aborigines+iq
    • http://dovetail37art.com/uploads/1/3/0/6/130621771/ripomuwo.pdf
    • http://niram.com/uploads/1/3/1/0/131070168/f2188.pdf
    • http://yambigo.org/uploads/1/3/0/6/130621185/nunonetad.pdf
    • http://sdcautomation.net/uploads/1/3/1/4/131437655/5586278.pdf
    • http://epindustries.uk/uploads/1/3/0/6/130605075/lofelogew.pdf
    • http://greenfoliophoto.com/uploads/1/3/0/5/130539842/lazafararemu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dcd.bin
069051508628a94fe4a272e99cd8f68dc38d3fe26ad10a8a3503936c0f8f82e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DCD 9828 bytes
font_01_sfnt_off0000a234.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA234 16036 bytes

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