Malicious PDF — malware analysis report

Static analysis result for SHA-256 0667faaa82867218…

MALICIOUS

PDF

41.6 KB Created: 2020-04-16 02:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 06a9d93d93b6eae6719ed7b099c79738 SHA-1: aabd19cb9ccafd926a4480195d8acd5580a21f68 SHA-256: 0667faaa8286721800543965fdd120cef06e28249078020fc47b3ef6eacee35d
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to various domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The document body, though heavily obfuscated, contains references to these URLs. The primary function appears to be directing users to these external resources, which could be for SEO spam or to host further malicious content. No scripts were extracted, but the structure suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://tristanvo.com/uploads/1/3/0/3/130312986/130312986.html#charlotte%27+s+web+worksheets
    • http://museandreign.com/uploads/1/3/1/4/131408298/genodisilajifavivi.pdf
    • http://archinterface.net/uploads/1/3/1/4/131438044/wuguzixitalataze.pdf
    • http://brianspillman.org/uploads/1/3/0/7/130739591/pilifeguz.pdf
    • http://pocketbricks.com/uploads/1/3/1/4/131412362/494902.pdf
    • http://pro-certs.com/uploads/1/3/0/5/130588145/tibetuwisebitu_lobupotudikupoz_sanigome.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_off00007901.bin
01785273468b48a3d2d6339f07311da8505e579b493cb5da9293e73dd676c065		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7901 8408 bytes

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