Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f85a16e512ba0f6…

MALICIOUS

PDF

28.4 KB Created: 2020-06-14 17:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87d3697a30d43045a77da5bcae9e1cf4 SHA-1: 15cf03f995cc5ff04b4a1d1f67ed2490ab14ab50 SHA-256: 5f85a16e512ba0f6bcaffec0db27b8da254af6a88f91016652c1377b30b2c61e
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are part of a link farm designed to artificially inflate search engine rankings. The primary URL, http://74-123-78-8.mgwnet.com/uploads/1/3/1/3/131384402/131384402.html#emerson+2gb+mp3+player+manual, suggests a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious activity. No scripts were extracted, but the structure and embedded links point towards a phishing or malware distribution attempt.

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://74-123-78-8.mgwnet.com/uploads/1/3/1/3/131384402/131384402.html#emerson+2gb+mp3+player+manual
    • http://southern-snow.com/uploads/1/3/1/6/131636601/3188921.pdf
    • http://hemp-life.info/uploads/1/3/1/1/131164043/4041535.pdf
    • http://anzini4eid.com/uploads/1/3/1/4/131437607/zibedujusupowalimu.pdf
    • http://exchange19.ccfiji.com/uploads/1/3/0/7/130774964/7610354.pdf
    • http://living-twenty.com/uploads/1/3/0/3/130313319/4849509.pdf
    • http://peghorner.com/uploads/1/3/1/8/131872042/lelilixib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://xekotaz.files.wordpress.com/2020/06/13621970131.pdf
    • https://xewugof.files.wordpress.com/2020/06/legewinufuvumadepivugap.pdf
    • https://fifeluvup.files.wordpress.com/2020/06/34518129007.pdf
    • https://nedajepo507710614.files.wordpress.com/2020/06/2516119887.pdf
    • https://gekibaxa318617197.files.wordpress.com/2020/06/54921528344.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004441.bin
86759393a7c3361b7a1e4d69d5093dbc3c0f1c2b069b48c0fac9ea3309d0a192		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4441 9652 bytes

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