Malicious PDF — malware analysis report

Static analysis result for SHA-256 15783c98dd59c63b…

MALICIOUS

PDF

42.4 KB Created: 2020-06-02 00:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e2937d4e1780935aaa878e30a93fbc3 SHA-1: 3b4da6dcf7d30a3843c7d1c922c30bcd4109127d SHA-256: 15783c98dd59c63b5b48e5879dd7311db2e2b1713984ac3751b4a5ade0769ebc
96 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 different domains, indicating a link farm or content distribution scheme. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest a tactic to drive traffic or distribute potentially harmful content, possibly as part of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://baanjaidee.com/uploads/1/3/1/3/131383747/131383747.html#world+geography+review+answers
    • http://watergardentherapy.com/uploads/1/3/0/6/130620928/8494414.pdf
    • http://bryanblue.com/uploads/1/3/0/5/130589131/majosufutukajo.pdf
    • http://mslc.email/uploads/1/3/0/5/130546118/tifew.pdf
    • http://threeandsevenmeals.com/uploads/1/3/0/3/130323157/sunudexaju-lebed-juwisuropomi.pdf
    • http://buteykobreathingeducator.org/uploads/1/3/0/7/130775551/gadap_boradezivo.pdf
    • http://live.redolivestudios.com/uploads/1/3/1/6/131606193/4847089.pdf
    • http://rwpdivephotography.com/uploads/1/3/0/3/130313190/6572114.pdf
    • http://peterjuhl.dk/uploads/1/3/0/6/130639966/lolupa-rukupozada-sodibogi.pdf
    • http://chef-jc.com/uploads/1/3/0/5/130589123/gotapogezevivatu.pdf
    • http://baanjaidee.com/uploads/1/3/1/3/131383747/terms.html
    • http://baanjaidee.com/uploads/1/3/1/3/131383747/dmca.html
    • http://baanjaidee.com/uploads/1/3/1/3/131383747/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://vedapam.files.wordpress.com/2020/06/8027287826.pdf
    • https://nogomexowe.files.wordpress.com/2020/05/58509634290.pdf
    • https://kudivex.files.wordpress.com/2020/05/fonataket.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_off00007966.bin
605f18964085183d04d7a3badff8d749d1b163812d4162ab6440f199594e8646		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7966 10704 bytes

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