Malicious PDF — malware analysis report

Static analysis result for SHA-256 377cd68be8fcc5f5…

MALICIOUS

PDF

35.1 KB Created: 2020-04-05 13:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 35358c92ffe836785d1672cd0eaffa12 SHA-1: ccc4f0307325a3e438c36a41295bedbca7761a84 SHA-256: 377cd68be8fcc5f5c9ecb678d299a3ca96b683ac203800b18ca3879e9edfa479
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The embedded document body text, while partially obfuscated, contains a URL that is also listed among the external links. This suggests the primary purpose is to redirect users to a network of websites, likely for SEO spam or to serve further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://marikacleaningservice.com/uploads/1/3/1/3/131380930/131380930.html#conjugate+verbs+in+present+perfect+tense
    • http://midcoteaparty.com/uploads/1/3/1/4/131437756/bopukeniz_sukuzizadeleji.pdf
    • http://hdube.org/uploads/1/3/1/4/131483155/sapepodip_zitigovates_piseduneko.pdf
    • http://cosmicascensions.com/uploads/1/3/0/6/130604539/4256096.pdf
    • http://gogeneralalarmco.com/uploads/1/3/1/3/131398077/123813dc.pdf
    • http://wilkwatchworks.ca/uploads/1/3/1/1/131164364/sawomikupu.pdf
    • http://landclearinghoover.com/uploads/1/3/0/5/130551621/c3ad15.pdf
    • http://pinkorblue.org/uploads/1/3/0/8/130814516/5014244.pdf
    • http://gandersonhomes.com/uploads/1/3/0/5/130551319/eafecb640359c5.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_off00005de6.bin
f216aa8dfff4ca355f34ef01f950421062c1dd4716f6f6c6ccc422a711c2465d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE6 8792 bytes

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