Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e02b5c51bdf5475…

MALICIOUS

PDF

45.4 KB Created: 2020-05-21 23:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d39fcb028ba797b3bd22e69281501d82 SHA-1: 4d347bb83f636d898f077ee6d782c422cbd42f33 SHA-256: 1e02b5c51bdf547543377969326f9b71f14facb6b5931074a94c1c1cf8e14d9c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded document body, though heavily obfuscated, contains URLs that are consistent with the link farm heuristic. The primary attack pattern appears to be directing users to a network of websites, likely for SEO spam or to host further malicious content.

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://evchargersinbath.co.uk/uploads/1/3/0/7/130776485/130776485.html#nat+turner+apush
    • http://bodyoilsdirect.com/uploads/1/3/0/7/130738484/narirak.pdf
    • http://choman-roger.com/uploads/1/3/0/4/130483566/a837727c0.pdf
    • http://t-i-d-b-i-t-s.com/uploads/1/3/0/7/130776078/gobad.pdf
    • http://alwaysabelleboutique.com/uploads/1/3/0/4/130488565/vibezijo.pdf
    • http://speakeasy-communications.com/uploads/1/3/0/5/130590139/kinogofemelilaf.pdf
    • http://halidacatic.com/uploads/1/3/0/7/130776573/zofifig-dalapu-subobukefokex.pdf
    • http://sstvipgroup.com/uploads/1/3/0/5/130541103/a40178022b.pdf
    • http://prepboys.net/uploads/1/3/0/3/130323506/5ee651a2a63f.pdf
    • http://idealsurface.org/uploads/1/3/0/3/130379285/14228f.pdf
    • http://itslavish.com/uploads/1/3/1/4/131453283/168949.pdf
    • http://filemakerwebandios.com/uploads/1/3/0/9/130969090/34bbd267a3aa.pdf
    • http://whitetable.net/uploads/1/3/0/2/130271259/2916476.pdf
    • http://rqtrucking.com/uploads/1/3/1/3/131382982/0986c17ca.pdf
    • http://spendtheday.net/uploads/1/3/0/3/130379297/2233678.pdf
    • http://glycineholdings.com/uploads/1/3/0/6/130620494/1634638.pdf
    • http://sleepmattersperth.com/uploads/1/3/0/2/130289239/3766318.pdf
    • http://emmajo.org/uploads/1/3/0/5/130545189/kozipegilizofujofu.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_off00008792.bin
21ca0168d9ee258e213237e76b0b9ad02d181350849bf5f4d74fd1572e34b3d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8792 10240 bytes

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