Malicious PDF — malware analysis report

Static analysis result for SHA-256 0282cb25aba0e16f…

MALICIOUS

PDF

37.7 KB Created: 2020-04-27 10:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e3cda9880667f88e99751d5d07983c30 SHA-1: d6000543046e922c1a03c4a491847183f6fdc5c5 SHA-256: 0282cb25aba0e16f0b988e8173f1f6e7db2a04d9e7a40c5920829bb615b2fa13
136 Risk Score

Malware Insights

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

The PDF contains a large number of links to external PDF files hosted on various domains, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious. The document body, though partially corrupted, contains a URL that matches one of the extracted links, suggesting an attempt to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allveteransday.com/uploads/1/3/0/8/130813834/130813834.html#figurative+language+review+quiz+answer+key
    • http://caucasianrace.com/uploads/1/3/0/6/130604098/ruwow.pdf
    • http://differentplacefordifferentpeople.com/uploads/1/3/1/4/131453176/nevubikibozoxin-peleb.pdf
    • http://luchalibrevive.com/uploads/1/3/0/5/130550859/3437118.pdf
    • http://andokelly.com/uploads/1/3/1/0/131070071/rozitipegosabi.pdf
    • http://bvcfnewburgh.org/uploads/1/3/0/8/130874368/4333564.pdf
    • http://gogoreadgo.com/uploads/1/3/0/5/130551859/2662979.pdf
    • http://sunflowerbaseball.com/uploads/1/3/0/2/130289690/9429557.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_off00006de4.bin
72390c089e962e198a46da959ecb59f5fe646b3b2e966dbbef3dda30adda5658		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE4 7420 bytes

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