Malicious PDF — malware analysis report

Static analysis result for SHA-256 a315d18f34c7d383…

MALICIOUS

PDF

89.3 KB Created: 2020-03-29 12:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cb69694363495d126e27bf0ce2a4f5a4 SHA-1: 1fbf300dadaf8404c2fa6f34008112d13de7c373 SHA-256: a315d18f34c7d383aa9a64f56eee28df7be138b048a9e6eaf32d63104ddbb358
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to PDF files hosted on various domains. The document body itself is largely unreadable due to encoding issues but contains a title related to public opinion and media, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous SEO-like links indicates a potential SEO spam or content distribution scheme. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://host37.carmichaelnl.com/uploads/1/3/0/5/130545475/130545475.html#relacion+entre+la+opinion+publica+y+los+medios+de+comunicacion
    • http://escala-activewear.com/uploads/1/3/0/3/130313480/6668c6bbe.pdf
    • http://officialzero.com/uploads/1/3/0/9/130969824/xezuvowezavo.pdf
    • http://luketurnerliar.com/uploads/1/3/0/6/130639147/fowenerufe.pdf
    • http://kaseyscottmusic.com/uploads/1/3/0/5/130545895/2424952.pdf
    • http://beltwaymissionireland.com/uploads/1/3/0/6/130622073/sarimasowabalatiro.pdf
    • http://uppercervicalpro.com/uploads/1/3/0/4/130488322/fefubo.pdf
    • http://schulemengestorf.ch/uploads/1/3/1/4/131406075/2b3b4ec1.pdf
    • http://vintagelatina.com/uploads/1/3/0/5/130543569/bamabobodefonadareb.pdf
    • http://costaparadiso.holiday/uploads/1/3/1/4/131438538/cb9c8121.pdf
    • http://ambrosecustomtravel.com/uploads/1/3/0/9/130968976/balifutaganesu_lupididedakon.pdf
    • http://ecv1811.com/uploads/1/3/0/7/130775624/4713038.pdf
    • http://chesterandoscar.com/uploads/1/3/0/8/130874277/5956b10ea.pdf
    • http://katskakery.com/uploads/1/3/1/1/131163976/1770e.pdf
    • http://andreasjorgens1.com/uploads/1/3/0/5/130539046/nojilipusot.pdf
    • http://oneilllab.com/uploads/1/3/0/5/130543054/592480.pdf
    • http://jjeng120.com/uploads/1/3/0/4/130476429/516252.pdf
    • http://kookaburraretreats.com/uploads/1/3/0/6/130620797/vebel.pdf
    • http://natalieannjohnson.net/uploads/1/3/0/5/130544089/4e17c82825873a.pdf
    • http://activitylead.com/uploads/1/3/0/6/130640155/gojononolepogux_mafunavurofeni.pdf
    • http://4eyesdesignz.com/uploads/1/3/0/6/130605016/86a35ecc08d.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_off000130e8.bin
7b9a80b8510e77f6be10eaff357af151d627e371c09314fd876bb9477763be50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130E8 10068 bytes

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