Malicious PDF — malware analysis report

Static analysis result for SHA-256 1606dae195214d23…

MALICIOUS

PDF

41.2 KB Created: 2020-04-12 15:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 373c407989043e27a7db6ce2ba1041f4 SHA-1: fe6b8a64b83b161488954e40f267eaee9b732d33 SHA-256: 1606dae195214d23464865c60a1b93f4e902913fb0f816d0d9d88c5e260f8263
96 Risk Score

Malware Insights

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

The PDF contains embedded links that are part of a link farm, suggesting a tactic to drive traffic to potentially malicious sites. The document body, though heavily obfuscated, contains a URL that mimics a USCIS requirement, likely a lure to entice users to click on the malicious link. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ywcakankakee.com/uploads/1/3/0/4/130435715/130435715.html#uscis+birth+certificate+translation+requirements
    • http://luxiairdeliveryservice.com/uploads/1/3/0/7/130775775/1500501.pdf
    • http://davidbcarlisle.com/uploads/1/3/0/6/130603715/sadimozuxatifisali.pdf
    • http://ariascinc.com/uploads/1/3/0/6/130603835/2222915.pdf
    • http://mercantiledarlings.com/uploads/1/3/0/8/130874316/1186425.pdf
    • http://jjdmusic.com/uploads/1/3/1/3/131379280/vakugizubawulut.pdf
    • http://buy-fedex.com/uploads/1/3/0/9/130969166/2375764.pdf
    • http://moroneyfororangetown.com/uploads/1/3/1/4/131438176/lupufuromet_fedajuj_bujaxerid_mikifibuji.pdf
    • http://lydia-bravo.com/uploads/1/3/0/5/130589000/logijagakonobepawul.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_off00007979.bin
ffb4919029feb641c04f61bf706743bf70b2b7334fb64df9dd21f90561860072		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7979 8228 bytes

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