Malicious PDF — malware analysis report

Static analysis result for SHA-256 003e8f6f5ee81186…

MALICIOUS

PDF

33.7 KB Created: 2020-06-15 19:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cec244d2c5fb3cba8857617b378f74e9 SHA-1: 9ec0c7e345ce10265c60b1a079f3ed2cc0cd6d1f SHA-256: 003e8f6f5ee811867f26947be38378ab70c8f555e9e65599b8207830de9020fd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious File

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text, though garbled, contains a URL that appears to be a lure for a tutorial, which is likely a pretext to drive traffic to the numerous other linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://webmail.tidewaterclassical.com/uploads/1/3/0/5/130543813/130543813.html#ruffled+fleece+scarf+tutorial
    • http://mcirish.com/uploads/1/3/0/5/130541077/63dd4015461a3e.pdf
    • http://webdisk.tyraburton.com/uploads/1/3/0/6/130605421/9321140.pdf
    • http://vh.undesirable.us/uploads/1/3/1/4/131454580/3e43b8.pdf
    • http://nextlevelmortal.com/uploads/1/3/0/5/130541950/d8341.pdf
    • http://mail.kindredcoffeeroasters.com/uploads/1/3/1/3/131381078/bolivape.pdf
    • http://mail.stpaulcap.org/uploads/1/3/1/8/131871856/2644508.pdf
    • http://mdbillingandconsulting.com/uploads/1/3/0/7/130775763/renagef.pdf
    • http://stmoritzstkilda.com.au/uploads/1/3/0/5/130543207/muzanekogiz_penidejuges_jojamoko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056d1.bin
22dccdcd30511de5f75a992d459f0b1e32ddd2bee298a1fd42f03869387426c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56D1 10728 bytes

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