Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc5dcbd5c66426a…

MALICIOUS

PDF

35.5 KB Created: 2020-04-17 12:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ce9b441a39ffe2ac36a5deb2739f11f5 SHA-1: 95d8684e1809742f16731be66550f2cef7bb1493 SHA-256: 5fc5dcbd5c66426a6cd5be1043605fbb9c51a393aa1502d4f5af203538c116a1
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on various domains, indicating a link farm or redirection mechanism. The ML classifier strongly identified this PDF as malicious. The presence of embedded URLs and the heuristic firing for PDF_RANDOM_URL_LINK suggest the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://hawkinsvillemercantile.online/uploads/1/3/0/7/130775352/130775352.html#errata+sheet+corrections
    • http://starpathstudios.com/uploads/1/3/0/6/130604495/2556203.pdf
    • http://innerworkcollectivepartnership.com/uploads/1/3/0/4/130475938/mibufevekoriral-zekavuxorivad-depofagugitiru.pdf
    • http://vhcoaching.fr/uploads/1/3/0/5/130551247/jatigej.pdf
    • http://lunartouchreiki.com/uploads/1/3/0/6/130604516/bf8ac9cf2d63b13.pdf
    • http://revelationsmagazine.com/uploads/1/3/0/2/130287367/1396520.pdf
    • http://thepremiumpost.com/uploads/1/3/1/3/131379255/772901.pdf
    • http://iventureemsys.com/uploads/1/3/0/8/130813037/xisovenop.pdf
    • http://sdguidedsnowgoose.com/uploads/1/3/0/6/130603941/2813005.pdf
    • http://mesaccontractorsllc.com/uploads/1/3/1/6/131637136/04686aa3.pdf
    • http://trashintransit.net/uploads/1/3/0/4/130483852/3698303.pdf
    • http://professionalsinteam.com/uploads/1/3/0/7/130775328/rumujotadodedob-mobano-dizivalakukizo.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_off00006218.bin
92f503e6eeaa2f9e3b8a0208bf6424833efa455ec5871293ec0d49db8961c6e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6218 7836 bytes

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