Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a34af737856358…

MALICIOUS

PDF

36.0 KB Created: 2020-06-09 02:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 2163144f7f0dea536463e87d6d20e230 SHA-1: 9878f76c15bb8f89c69a0dc41b8592d9d3cf7edc SHA-256: a1a34af73785635842697f7fc7dddc4770e13aa5eaa2c50df01b4b25932c47e3
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs point to various domains, suggesting a link farm or redirection mechanism. The document body contains garbled text and some of the URLs, indicating a potential lure or phishing attempt.

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://killeenmasonry.com/uploads/1/3/0/2/130270873/130270873.html#ygs+say%25C4%25B1lar+%25C3%25A7%25C4%25B1km%25C4%25B1%25C5%259F+sorular
    • http://passionatescentedcandles.com/uploads/1/3/0/9/130969270/zixenuvapijo-niresovagaxaku-bipowuzaruza.pdf
    • http://redlitestudio.co/uploads/1/3/0/6/130621608/2100004.pdf
    • http://74-123-77-83.mgwnet.com/uploads/1/3/1/0/131071210/wapusowov_dulemesipubidi.pdf
    • http://cryptosecureexchange.com/uploads/1/3/0/5/130546457/wovorijakesula.pdf
    • http://littlemusic.org/uploads/1/3/0/5/130538923/rakimikagudugil.pdf
    • http://moolahntattoos.com/uploads/1/3/0/5/130551115/d30009d9ea7.pdf
    • http://leadexllc.com/uploads/1/3/0/4/130490019/mexusowusikew_marebexupu.pdf
    • http://autodiscover.wonderstonefilms.com/uploads/1/3/0/6/130622013/tobonadubabo.pdf
    • https://kuperira.files.wordpress.com/2020/06/72586131800.pdf
    • https://xojezetegako.files.wordpress.com/2020/06/gonokuzo.pdf
    • https://vorafeza352172661.files.wordpress.com/2020/06/rixudizomusakiwupo.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_off00005e28.bin
4f8de4953004eb779210323d9c6d987f718a0e4f409b07869028b7ce9906851c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E28 11756 bytes

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