Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0e81fb1c50dba6…

MALICIOUS

PDF

45.5 KB Created: 2020-04-11 07:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b1ed99ae588d01648b721faa1c53d1a1 SHA-1: 49b11f03d4b8f5cc3695fd74b6988dc5c421de4c SHA-256: 0a0e81fb1c50dba629146ef979a6285e9b68003a9ce7752f6422bf9f84032dc0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which point to PDF files with numeric slugs, suggesting a link farm for SEO manipulation or malware distribution. One of the embedded URIs, 'http://74-123-77-80.mgwnet.com/uploads/1/3/0/4/130488543/130488543.html#report+from+iron+mountain', is presented as a report, likely a lure to entice users to click and potentially download further malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://74-123-77-80.mgwnet.com/uploads/1/3/0/4/130488543/130488543.html#report+from+iron+mountain
    • http://clarkseedsllc.com/uploads/1/3/0/9/130969648/30bcb5a.pdf
    • http://flotillafarce.com/uploads/1/3/0/7/130776308/rekavolofeno-widinowaxuxad-rulanigubekad.pdf
    • http://kateyanne.com/uploads/1/3/1/3/131382536/bigodulepabe_xotefaga_gupex.pdf
    • http://switchpreston.com/uploads/1/3/0/5/130539319/7239212.pdf
    • http://danielduquette.com/uploads/1/3/0/4/130488875/ronaxupulo-zavemolofoseta-dogin.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_off00008a0b.bin
4125e82a11f108c4e571444a023cd70d4091db6f3a12e93024493a2c77a4d4a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0B 8436 bytes

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