Malicious PDF — malware analysis report

Static analysis result for SHA-256 79db5442c97913b8…

MALICIOUS

PDF

42.2 KB Created: 2020-06-17 08:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a499c7baf8a50a08314de64b815d2e1 SHA-1: beef3743d160c2fca901d189b64affe73413d25f SHA-256: 79db5442c97913b837bc92e1385905e12d20f564b2d268d9141a25aaf19969ca
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO spam campaign. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a potential distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://hyperion-ai.com/uploads/1/3/1/4/131409148/131409148.html#ccie+written+dumps+pdf
    • http://tradealchemist.com/uploads/1/3/1/4/131407665/db3d1f098bbedeb.pdf
    • http://sassysistersboutique.shop/uploads/1/3/1/8/131857215/f11a4f6ef5fdd3.pdf
    • http://andreabauchowitz.com/uploads/1/3/1/3/131380341/ravexov.pdf
    • http://cpanel.dicksonarchitecture.com/uploads/1/3/0/5/130588342/2635339.pdf
    • http://choosedifferent.co.uk/uploads/1/3/0/5/130543272/lijanararabo_pudatetaniguwav_fepoterelibog_fiviwusotelod.pdf
    • http://frenchhomesolutions.com/uploads/1/3/0/3/130313115/nexavadonadisat-duleme.pdf
    • http://gallery-imperial.com/uploads/1/3/1/4/131407705/62507a434dac.pdf
    • http://mx.visavisdurango.com/uploads/1/3/0/6/130603935/6978661.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off000065af.bin
36a24b1f164206aecd62febf5380b26b417b196756f83c205ba46e589486abe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65AF 4948 bytes
font_01_sfnt_off00007675.bin
add9162441429ca222a045d3fa043b228a6037d5ba7e2a49f78ff095a0d61dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7675 11376 bytes

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