Malicious PDF — malware analysis report

Static analysis result for SHA-256 755c1232eb0a9149…

MALICIOUS

PDF

47.2 KB Created: 2020-03-29 22:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 53e36c70e98b604fa3f6446aed3c0687 SHA-1: 1b42f8e56c6d7143468fb3ab012506da607a5135 SHA-256: 755c1232eb0a9149104cf8953b6e282271fae37e5bafb2956da57f7daae488a9
96 Risk Score

Malware Insights

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

The PDF contains numerous external links disguised as educational content, indicating a link farm or redirection scheme. The ML classifier strongly identified this PDF as malicious, and the presence of embedded URLs suggests an attempt to direct users to potentially harmful sites. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document designed to lead users astray.

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://hall-elopement.rominastiebenphotography.com/uploads/1/3/1/4/131408027/131408027.html#sadlier+vocabulary+workshop+level+e+unit+5+vocabulary+in+context
    • http://traumainformedleadership.com/uploads/1/3/0/5/130540182/torexoxuxegal.pdf
    • http://topdollar4junk.com/uploads/1/3/1/3/131379255/dokufawezisemaneja.pdf
    • http://gregneville.net/uploads/1/3/0/3/130323936/5965038.pdf
    • http://ryaportland.com/uploads/1/3/1/3/131384495/93a73f4.pdf
    • http://weeklyonline.info/uploads/1/3/0/7/130775558/getajebilak_wudar_xedatu_visuwubo.pdf
    • http://theheartshapedrock.com/uploads/1/3/0/8/130813063/nobifopadidozi.pdf
    • http://victorypraiseworshipcenter.net/uploads/1/3/1/3/131379525/5347514.pdf
    • http://letssimplify.us/uploads/1/3/0/4/130483373/5181974.pdf
    • http://maisyabroad.com/uploads/1/3/0/6/130639363/jiwajovimejuza.pdf
    • http://m-zitko.si/uploads/1/3/1/0/131071145/bodudasokezo.pdf
    • http://zachbebel.com/uploads/1/3/1/0/131070571/0adc0bddbd4f8.pdf
    • http://coloradocabinrestoration.org/uploads/1/3/0/6/130621788/sozatav.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_off0000926b.bin
c6aeb9806910d9b3a1d9b5afea72b4b31f376fa22b8505390b2a22881f62671d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x926B 7540 bytes

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