Malicious PDF — malware analysis report

Static analysis result for SHA-256 662ed6f2c7a4bab4…

MALICIOUS

PDF

36.8 KB Created: 2020-04-08 22:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f9dcdd64da42af5272c876c427996014 SHA-1: 8f656d4ead7afc8831259b80821940fd4b1c52e9 SHA-256: 662ed6f2c7a4bab424c1495e1601dcbf7c138b85bc55d5a2bdaa7708f1f602dc
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, indicating a link farm for SEO manipulation. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the structure suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smilehearthk.com/uploads/1/3/0/6/130639275/130639275.html#microsoft+visual+studio+2010+ultimate
    • http://skyleslawfirm.com/uploads/1/3/0/7/130775892/6611cb0.pdf
    • http://michaelangelograyson.com/uploads/1/3/0/4/130476866/rozajifoput_xakuni.pdf
    • http://gallery.luchamelphoto.com/uploads/1/3/0/6/130604982/diveluj.pdf
    • http://valuemanifesto.org/uploads/1/3/0/6/130620660/40e1047f678dab.pdf
    • http://antmacgroup.com/uploads/1/3/1/3/131381819/ripenuwox.pdf
    • http://liveoaktrolley.com/uploads/1/3/0/8/130813948/419e64bf2741.pdf
    • http://centralstaffingchicago.com/uploads/1/3/0/3/130379561/cadf033d6.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_off00006554.bin
e63438c5828f6ec863b6ea360af37f777808f418b3ffac104f3bf6660318d1db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6554 8192 bytes

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