Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b67dc8259a3ea91…

MALICIOUS

PDF

43.2 KB Created: 2020-04-27 07:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2f6354e06ec043a8ff7211add5480aa9 SHA-1: cb97aa3a6e6bb0b204a608c9bb6e69a9ce5fc147 SHA-256: 1b67dc8259a3ea91e9d63aa1d7447bdba7c8a90ddd405f37d596a34aca175ae8
94 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous external URLs pointing to other PDF documents. The document body text, though partially corrupted, suggests a lure related to "Domain driven design blue book pdf". The heuristic PDF_SEO_LINK_FARM strongly indicates a malicious intent to manipulate search engine results or distribute content through a network of linked PDFs. The ML classifier also flagged this PDF as malicious with high confidence.

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://harrisonrappaport.com/uploads/1/3/0/2/130287881/130287881.html#domain+driven+design+blue+book+pdf
    • http://sbminerdesign.com/uploads/1/3/0/6/130621713/8864401.pdf
    • http://shesellsseashellsjewelry.com/uploads/1/3/1/4/131453034/jimam-totajabevep.pdf
    • http://mollymaeburrows.com/uploads/1/3/0/8/130874313/8a298ffec7.pdf
    • http://prepforstudentsuccess.com/uploads/1/3/0/5/130551823/mubuxifum_xofuga_wusupe.pdf
    • http://cornwallvillage.com/uploads/1/3/0/5/130588352/tosurubodo.pdf
    • http://acyfiscales.com/uploads/1/3/0/4/130488850/fb1d4c888919367.pdf
    • http://mandagefoundation.org/uploads/1/3/0/8/130873978/cab8fc.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_off00008134.bin
4e3acb33dc9f6c06f76780417530bfcdac3217cf67faac8dddbc5c5d95b129ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8134 8252 bytes

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