Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f58b05799e6e026…

MALICIOUS

PDF

35.9 KB Created: 2020-03-23 11:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 272ebb8973c8900b0e37391fec404483 SHA-1: b369bd5bb2b577e943c6adbccb229d0bb1d2b3f3 SHA-256: 0f58b05799e6e02629232f1563ffe1292edd5a99af4316992a6783adb831f393
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a distribution point for further malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and embedded URLs are indicative of a phishing or SEO poisoning attack.

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://304america1st.com/uploads/1/3/0/6/130640136/130640136.html#ficha+medica+escolar
    • http://www.insulationprostemple.com/uploads/1/3/0/6/130621086/disulejigudojonozafa.pdf
    • http://plantdrpeter.com/uploads/1/3/0/6/130605376/wewek-tozure-sutikitoj.pdf
    • http://www.doctorsagesblog.com/uploads/1/3/0/4/130435757/7198278.pdf
    • http://pbldurhamyouth.org/uploads/1/3/0/4/130435998/86a1954.pdf
    • http://codataschool.fr/uploads/1/3/0/7/130738821/nekuwixuvimuxamub.pdf
    • http://theofficialwealthbuilders.com/uploads/1/3/0/8/130874031/5591828.pdf
    • http://evangottesman.com/uploads/1/3/0/2/130270793/nijone.pdf
    • http://sethnjill.com/uploads/1/3/0/6/130621191/7f0a95aa0001c.pdf
    • http://rockout.live/uploads/1/3/0/6/130620691/sodebozupole.pdf
    • http://operationgringo.com/uploads/1/3/0/2/130289278/mozetidugalalevo.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_off00006149.bin
e9da3f6a6541ac5faf4dfaa71b91834e0103a885c4603213887baf22348f5a27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6149 9988 bytes

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