Malicious PDF — malware analysis report

Static analysis result for SHA-256 153aeb01bced6111…

MALICIOUS

PDF

35.7 KB Created: 2020-04-06 09:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7ab7c77fcb3316c633216df3a50a9875 SHA-1: ad1e20791db37dd10518bce75831b86ee0b53b76 SHA-256: 153aeb01bced6111707a6f8a7d6cc697eed773b9505753ce71b3a8f128915c50
96 Risk Score

Malware Insights

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

This PDF document contains numerous links to external PDF files and a primary link disguised as an 'internet explorer 11 update'. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to host malicious content or redirect users to phishing sites. The document body, though heavily obfuscated, contains the primary lure URL.

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://yogawithkai.com/uploads/1/3/0/5/130551247/130551247.html#code+9c47+internet+explorer+11+update
    • http://artesteem.com/uploads/1/3/0/9/130969429/e18f139f2a93.pdf
    • http://dannysunlocking.com/uploads/1/3/0/3/130313426/fiwug-vosaza-sawidesupova-xomugu.pdf
    • http://riautoelectric.com/uploads/1/3/0/8/130814056/7836455.pdf
    • http://swingingcool.ch/uploads/1/3/0/5/130539048/4772657.pdf
    • http://mercadohuanacaxtle.com/uploads/1/3/0/4/130435813/5202018.pdf
    • http://usflatratemovers.com/uploads/1/3/0/3/130379274/1385725.pdf
    • http://thrilljar.com/uploads/1/3/0/6/130621606/26b5556.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_off0000628c.bin
81fa03dcc2bc106b4a0498673b754b1ba7a8619608afa8172d029b3c617d4c81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x628C 8216 bytes

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