Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4dd96d4f059902f…

MALICIOUS

PDF

47.0 KB Created: 2020-03-21 11:14:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d5cb2b933c2ff0f0c802c46dc25ad69f SHA-1: c0e0ea52adf0052759bc34607325a26f0d847930 SHA-256: f4dd96d4f059902f52b4fb2aa1a06d54235f946399708ed1335fa5e732d2d142
94 Risk Score

Malware Insights

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

The PDF 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 drive traffic or distribute further payloads. 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://baylandesign.net/uploads/1/3/1/0/131070313/131070313.html#etica+y+valores+bachillerato+pdf
    • http://canadianhorseshoeing.com/uploads/1/3/0/3/130379065/12e9e98f26a.pdf
    • http://www.kenthickeymusic.com/uploads/1/3/0/7/130776828/2981094.pdf
    • http://www.blakedigitalmarketing.com/uploads/1/3/0/6/130621026/1444729.pdf
    • http://escapekewanee.com/uploads/1/3/0/6/130620822/6037788.pdf
    • http://sostenibilidaddelmenor.com/uploads/1/3/0/6/130621315/latosil_gerijufosokipe_mazekesaxopubin.pdf
    • http://ahwv.org/uploads/1/3/0/4/130483286/kukivuledaroban-kaxekemunoxi.pdf
    • http://crimeartistcom.com/uploads/1/3/0/3/130379422/1657454.pdf
    • http://theconglamerate.com/uploads/1/3/0/5/130550813/tuzojolifi.pdf
    • http://sophiemultiservicesllc.com/uploads/1/3/0/6/130605206/b5fa6672.pdf
    • http://hta2.com/uploads/1/3/0/3/130313649/4931084.pdf
    • http://pmckfunctionalfitness.com/uploads/1/3/0/2/130287971/9092192.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_off00008dae.bin
81f4b2ab9518fe764282512652fa2e17457fd80276696cab3be0d9a580aecaec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DAE 9420 bytes

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