Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a54a52241824651…

MALICIOUS

PDF

39.9 KB Created: 2020-06-08 21:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0de26f3b50b91f996b0d045004d12ad4 SHA-1: cc20680e0e685b289a1d2076e9dfbb916003ef91 SHA-256: 9a54a52241824651c6c060f3f6be032f665ac9749d000c1aa216e781356f36bd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, a technique often used to create link farms for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple suspicious URLs supports this. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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://32g.undesirable.us/uploads/1/3/0/6/130604888/130604888.html#c%25C3%25A1ch+x%25C3%25B3a+t%25C3%25A0i+kho
    • http://mta-sts.magicalchicago.com/uploads/1/3/1/8/131871910/sunodinebememo.pdf
    • http://homechoicedistrict11.org/uploads/1/3/0/7/130739936/6308370.pdf
    • http://araujozilhao.com/uploads/1/3/0/8/130813896/4400475.pdf
    • http://apart.nu/uploads/1/3/1/4/131452821/wukopisizok.pdf
    • https://tofogaba.fil
    • https://sisunozu.files.wordpress.com/2020/06/71713866456.pdf
    • https://jinotazataga.files.wordpress.com/2020/06/95814807744.pdf
    • https://purupale.files.wordpress.com/2020/06/8015767171.pdf
    • https://metekaz.files.wordpress.com/2020/06/wuziwesowumimaxaxonira.pdf
    • https://tofogaba.files.wordpress.com/2020/06/52503481364.pdf
    • https://jefebelumewo.files.wordpress.com/2020/06/goseposuko.pdf
    • https://gixerusowave.files.wordpress.com/2020/06/barugufivepi.pdf
    • https://zorebatokaf.files.wordpress.com/2020/06/86313018225.pdf
    • https://ganesesuf.files.wordpress.com/2020/06/nogonukunebeziwitavifub.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_off0000649b.bin
8792ea078bcffad7708a8a2585aec19684e50b0a9cab77200242815f990305ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x649B 21108 bytes

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