Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6e50599c24140b…

MALICIOUS

PDF

40.4 KB Created: 2020-07-01 07:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d1486bae980dcf72a444cd6b6ee104f SHA-1: 175734adcd94d85822131e840e6508bbdb766c05 SHA-256: 7e6e50599c24140b3a35e9efe847c167f70e061b4557015d1cd167bdc3908e55
96 Risk Score

Malware Insights

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

The PDF document is designed to appear as a software testing automation framework guide but contains a large number of embedded links to external PDF files. These links are likely part of a link farm or a phishing campaign, aiming to direct users to potentially malicious content or websites. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link-farming or SEO manipulation tactic.

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://files.lumen-stem.com/uploads/1/3/0/6/130620758/130620758.html#software+testing+automation+framework+pdf
    • http://monthlymovers.net/uploads/1/3/0/6/130604056/dde742d6.pdf
    • http://jasonrafferty.jasonrafferty.com/uploads/1/3/0/2/130287817/3362005.pdf
    • http://darlingdiscounts.com/uploads/1/3/1/3/131383679/238f247e09.pdf
    • http://irvingconsultinggroup.org/uploads/1/3/1/8/131858045/6491502.pdf
    • http://mail.fufmusic.com/uploads/1/3/0/5/130543546/sadaladag.pdf
    • http://janemarin.com/uploads/1/3/1/4/131438474/wesufamuti.pdf
    • http://mail.teachenglishstepbystep.com/uploads/1/3/1/6/131637797/besizod.pdf
    • http://wdrmechanical.com/uploads/1/3/0/5/130589285/96e5b01fbfb29.pdf
    • http://artbycoleta.nl/uploads/1/2/9/3/129357681/129357681.html?canon
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://lotosam.files.wordpress.com/2020/06/58847852757.pdf
    • https://dipajar.files.wordpress.com/2020/07/fedadolafutup.pdf
    • https://sapojit.files.wordpress.com/2020/07/talawixo.pdf
    • https://runokuxuzeni.files.wordpress.com/2020/06/mefutadomoli.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f98.bin
38fe74e3aa0b46599145eda769099e2f64d94d09343dce69364ed63dd72bde1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F98 5468 bytes
font_01_sfnt_off00007224.bin
d16466d9761f53be53a7262dc0848fac563018d73376fbe2b2b2b6545dcf1536		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7224 10376 bytes

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