Malicious PDF — malware analysis report

Static analysis result for SHA-256 48bbf19019f47d9c…

MALICIOUS

PDF

39.4 KB Created: 2020-06-06 00:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c676965b58fc3ee884d69a646878505a SHA-1: e28d31f022ffafdaafe3553f7d5912a827182172 SHA-256: 48bbf19019f47d9c188bf039e378591f1c88da78723bb5328a74fa0b00ddfbb7
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent. The primary purpose appears to be directing users to download further malicious content from the listed URLs.

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://youshimehaozhuanqiandewangluoyouxi.br3h.com/uploads/1/3/0/7/130740597/130740597.html#623459300523+manual+download
    • http://ampatients.org/uploads/1/3/0/5/130544872/28f0853ee.pdf
    • http://mail.interlochtransport.com/uploads/1/3/0/8/130813786/lezisezetotasapikede.pdf
    • http://1602partners.com/uploads/1/3/1/3/131383630/3b6bd1793021d4.pdf
    • http://youshimehaozhuanqiandewangluoyouxi.br3h.com/uploads/1/3/0/7/130740597/terms.html
    • http://youshimehaozhuanqiandewangluoyouxi.br3h.com/uploads/1/3/0/7/130740597/dmca.html
    • http://youshimehaozhuanqiandewangluoyouxi.br3h.com/uploads/1/3/0/7/130740597/policy.html
    • https://velefibilon.files.wordpress.com/2020/06/nobasuperexeboku.pdf
    • https://pawojoteloje.files.wordpress.com/2020/06/17872701426.pdf
    • https://pegizibi.files.wordpress.com/2020/06/refizo.pdf
    • https://zapuxuj.files.wordpress.com/2020/06/45921302656.pdf
    • https://xuromud.files.wordpress.com/2020/06/libosuzisokixopebuvexubi.pdf
    • https://tanonikide.files.wordpress.com/2020/06/vefosegibetere.pdf
    • https://kimetaduwun.files.wordpress.com/2020/06/52548550942.pdf
    • https://vorosatigeb.files.wordpress.com/2020/06/wuvebekarotozeradugak.pdf
    • https://xoxijukixife.files.wordpress.com/2020/06/8495578064.pdf
    • https://kerivenulod.files.wordpress.com/2020/06/32525752658.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_off00006c7b.bin
df98ddff5fbada74515fe23168c58c5196fa3c88511e7f9ffe48556bc7f6d2a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7B 10900 bytes

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