Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db494a5e7b01d0a…

MALICIOUS

PDF

35.0 KB Created: 2020-06-05 23:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b02b7db3149a163e68331dc803394bb SHA-1: c323b0f3ca6d14444fb6bb25589561b7cb4ad4fb SHA-256: 7db494a5e7b01d0a6802741eee3588e0c4d0bb6002b9df373b327d48902e93d1
94 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body also contains a reference to 'inline hook win32k.sys removal', suggesting a technical lure. The primary intent appears to be directing users to potentially malicious or deceptive websites, as indicated by the numerous unknown reputation 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://shop.westcoastwhitening.com/uploads/1/3/0/7/130738506/130738506.html#inline+hook+win32k.+sys+removal
    • http://saltgcu.club/uploads/1/3/0/8/130813025/gibena_sexube_dojevilozaro.pdf
    • http://elenadaniele.com/uploads/1/3/0/7/130776647/feramaraz.pdf
    • http://poweredbytheblueoval.com/uploads/1/3/0/4/130477026/423c49acfd0b.pdf
    • http://shop.westcoastwhitening.com/uploads/1/3/0/7/130738506/terms.html
    • http://shop.westcoastwhitening.com/uploads/1/3/0/7/130738506/dmca.html
    • http://shop.westcoastwhitening.com/uploads/1/3/0/7/130738506/policy.html
    • https://zozemixon.files.wordpress.com/2020/06/tulipimulimabunu.pdf
    • https://wuxewaxijij.files.wordpress.com/2020/06/kegori.pdf
    • https://waxelot58946823.files.wordpress.com/2020/06/rakuzemejapupozof.pdf
    • https://fobizuwaj.files.wordpress.com/2020/06/56705062882.pdf
    • https://susulalite.files.wordpress.com/2020/06/jamibuxuzadalilumodag.pdf
    • https://mipupoveretu.files.wordpress.com/2020/06/41134331858.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_off00005e86.bin
6bbf6e5279e9e8c610fa2c37f681c8280b8f59e090e6a311ca620a3443eb9990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E86 9884 bytes

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