Malicious PDF — malware analysis report

Static analysis result for SHA-256 005b90a079bda430…

MALICIOUS

PDF

100.9 KB Created: 2020-05-31 20:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc5f1adbb5b5cc2bbd505d627da83182 SHA-1: ae7a6f7f813c42b1c6c9f4290da0c3faee528447 SHA-256: 005b90a079bda43023fc1e889347ae74b7f5fa6885335490405b6babc39e4ef0
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating a mass external PDF link farm, with one primary external URI pointing to 'http://wellnessbethechange.com/uploads/1/3/0/4/130476642/130476642.html#laser+weld+symbols+chart'. The document body, though heavily obfuscated, contains text related to 'Laser weld symbols chart' and the authoring application, suggesting a lure. The ML classifier strongly flagged this PDF as malicious.

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://wellnessbethechange.com/uploads/1/3/0/4/130476642/130476642.html#laser+weld+symbols+chart
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://tujozoxi.files.wordpress.com/2020/05/10089657748.pdf
    • https://zigadapojunu.files.wordpress.com/2020/05/gigepebigulotoz.pdf
    • https://tepafufamuvi.files.wordpress.com/2020/05/85313174932.pdf
    • https://paditiw.files.wordpress.com/2020/05/66472723411.pdf
    • https://kikibok.files.wordpress.com/2020/05/fizipuxudedikebewafa.pdf
    • https://digogaba.files.wordpress.com/2020/05/66793193719.pdf
    • https://jetufaru.files.wordpress.com/2020/05/losukubif.pdf
    • https://sipemuxi.files.wordpress.com/2020/05/28743166206.pdf
    • https://xibojiwox.files.wordpress.com/2020/05/nulabi.pdf
    • https://buvesapunuso.files.wordpress.com/2020/05/zuxasatirusumigolepirug.pdf
    • https://xadisazituku.files.wordpress.com/2020/05/13514137366.pdf
    • https://wovonatufe.files.wordpress.com/2020/05/safigejiso.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015fc0.bin
5275916b9f2c804dd37598eaa3c6370b583dc35215646e81c5182f7f62f0ad0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC0 11760 bytes

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