Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d71a83cce3c7ade…

MALICIOUS

PDF

36.0 KB Created: 2020-06-11 21:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b975de8fd28055ced794fe04746bc30 SHA-1: ba529850f13dcf3e25d9814af1e722a7cd1120e8 SHA-256: 6d71a83cce3c7adecea4c3e6b87f0204b36f4abfee73dc2869ad71b1d60013e6
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to external websites that appear to be part of a link farm designed to host other PDFs. The document body, though partially corrupted, suggests a lure related to a 'Microsoft works spreadsheet tutorial'. The presence of multiple external links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure and link farm heuristic strongly suggest a phishing or redirection attack.

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://2196eh.salon225.com/uploads/1/3/1/6/131607930/131607930.html#microsoft+works+spreadsheet+tutorial
    • http://conceptcasserole.com/uploads/1/3/0/4/130477490/gazipemikev.pdf
    • http://ensarioglu.com/uploads/1/3/0/3/130313253/a687b3a2d595266.pdf
    • http://greenvilleconcertband.us/uploads/1/3/1/3/131398543/vakolofipikomexuwub.pdf
    • http://jayatherton.com/uploads/1/3/1/6/131636843/9cfb9b1cb6182e7.pdf
    • http://mta-sts.biolivesoils.com/uploads/1/3/1/4/131454264/e86812286a2dc.pdf
    • http://autodiscover.integritypump.com/uploads/1/3/0/2/130289748/kutufij.pdf
    • http://hancharddesign.com/uploads/1/3/1/4/131482850/9ab8e1.pdf
    • http://maggietham.com/uploads/1/3/1/0/131070247/82d00eee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://javasevob.files.wordpress.com/2020/06/tovabalasegunavevorida.pdf
    • https://safanam.files.wordpress.com/2020/06/79946516763.pdf
    • https://kivolikosax.files.wordpress.com/2020/06/polerupivibiledala.pdf
    • https://tugajukovi.files.wordpress.com/2020/06/45791583964.pdf
    • https://jitalexevumo.files.wordpress.com/2020/06/larixozufer.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_off00006272.bin
9ce034cb938e45f7892ab38b4f2a5cfb782ecd8447b061125f82cb621141561f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6272 9816 bytes

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