Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bad9125b2be8f5…

MALICIOUS

PDF

36.1 KB Created: 2020-03-21 13:10:45 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 25453dd45453b59112d7b1c419d96e03 SHA-1: 036374c426c42bd365f9128802f8a4ca39c530a8 SHA-256: 77bad9125b2be8f5dc25313a102e4795edaf673ad22369d85e1f07be28faaded
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a link farm or redirection scheme, likely intended to distribute further malicious payloads or conduct phishing. 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://evokefitness.net/uploads/1/3/0/4/130489342/130489342.html#industrializacion+e+imperialismo+mapa+mental
    • http://kathiegreenmedia.com/uploads/1/3/0/6/130620877/xujulinomoripewukaf.pdf
    • http://www.renewnow.me/uploads/1/3/0/5/130538839/3399786.pdf
    • http://steambathparts.com/uploads/1/3/1/0/131070238/e1aaeda3f72aba.pdf
    • http://totalhealthandhomewellness.com/uploads/1/3/0/7/130776344/kamilabinexi.pdf
    • http://northstarmuseum.org/uploads/1/3/0/2/130287314/ditujepu.pdf
    • http://hmsyearbook.com/uploads/1/3/0/8/130813650/6772267.pdf
    • http://sojusurvivor.com/uploads/1/3/0/5/130589450/3429691.pdf
    • http://www.svetsatku.cz/uploads/1/3/0/5/130590278/6890661.pdf
    • http://newvisioncrane.com/uploads/1/3/0/9/130969336/1588809.pdf
    • http://www.cojoworldwide.com/uploads/1/3/0/8/130813369/8900279.pdf
    • http://propodcastcontrol.com/uploads/1/3/0/6/130639972/9951430.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_off00006643.bin
1abd12036b71b9f44cf7bf66fd1f6e3d1237a2af2a7e92333518dbf8d4844b7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6643 7968 bytes

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