Malicious PDF — malware analysis report

Static analysis result for SHA-256 76be831414783147…

MALICIOUS

PDF

29.9 KB Created: 2020-04-16 03:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6b7629141d4e4b3c9e09e2aaea73d0a4 SHA-1: 608fccb045d1875357f9be3f91386d99426742a4 SHA-256: 76be8314147831473abead14ea08183f618e04d8b1e34f89a79a00d448629396
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to external PDF files, indicative of a link farm or a distribution mechanism for further malicious content. The presence of a "download button" heuristic further supports the interpretation that this document is designed to trick users into downloading potentially harmful files. The ML classifier strongly flagged this PDF as malicious, reinforcing the suspicious nature of its content and structure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lacrosse360.shop/uploads/1/3/0/7/130775940/130775940.html#net+framework+4.+0++softonic
    • http://loquepasa.org/uploads/1/3/1/6/131606953/463335.pdf
    • http://newvisionyouth.org/uploads/1/3/0/5/130590724/58fdeb386506d.pdf
    • http://the-inla.ca/uploads/1/3/0/9/130969586/kotijibiki.pdf
    • http://debragoetz.com/uploads/1/3/0/6/130639710/c896b2f89.pdf
    • http://halliebezner.com/uploads/1/3/0/7/130776291/ab199de.pdf
    • http://sugarhaven.net/uploads/1/3/1/6/131637030/74694.pdf
    • http://rockitpr.com/uploads/1/3/0/8/130874219/280e48868ee.pdf
    • http://maeveleslieart.com/uploads/1/3/0/5/130551654/4106965.pdf
    • http://loveyourchildren.org/uploads/1/3/0/3/130379244/kufewolovale.pdf
    • http://harlancircle.com/uploads/1/3/0/7/130739656/c1238630.pdf
    • http://jenijohnson.net/uploads/1/3/0/6/130620598/wumulipa.pdf
    • http://masterpiecesofarchitecture.com/uploads/1/3/0/6/130639540/zopez.pdf
    • http://bennettandsonsltd.com/uploads/1/3/0/3/130323642/zofewagejudulas-vepubulurezexar.pdf
    • http://fitnowgal.com/uploads/1/3/0/4/130483087/b13f5db1d2edd5.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_off00004f6d.bin
ebfaa43328ffb35600ae4baa83f4f131a6502ff9129700fe7bc4bf6cb9fc1bf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F6D 7072 bytes

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