Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dafbbf8d89b8cc1…

MALICIOUS

PDF

37.7 KB Created: 2020-04-10 01:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 36b59315f5fd8aaa02d457cff60015af SHA-1: 661aa858b1bd24cbd99a4557f3bde3f79475890d SHA-256: 7dafbbf8d89b8cc1664a4ef4246327f459b0532857d7ab58b198447eb2273da2
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique commonly used in SEO spam and phishing campaigns to drive traffic to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to domains like 'gotocompany.org' and 'careadvocate.org' supports the conclusion that this file is part of a link farm or phishing operation. No scripts were extracted from this sample.

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://gotocompany.org/uploads/1/3/0/6/130604264/130604264.html#livro+psicopatologia+infantil+pdf
    • http://careadvocate.org/uploads/1/3/1/4/131438682/barog.pdf
    • http://buttscratches.com/uploads/1/3/0/2/130287929/kowuzanudagemup.pdf
    • http://sassysistersbtq.com/uploads/1/3/0/5/130551399/nokik.pdf
    • http://mandypickering.com/uploads/1/3/0/7/130738697/lenaxapo.pdf
    • http://poisonivyremovalnow.com/uploads/1/3/1/0/131070762/8757864.pdf
    • http://theslayway.org/uploads/1/3/0/6/130621407/15e6ab61.pdf
    • http://beesplant.com/uploads/1/3/0/6/130604702/ee8573.pdf
    • http://bruce-n-mikes-collectibles.com/uploads/1/3/0/2/130289782/5083643.pdf
    • http://nleautorepair.com/uploads/1/3/1/4/131437715/visotati-lemilovuwegelel-jakotigeluzamu.pdf
    • http://dlrapartments.com/uploads/1/3/1/4/131438563/1675749.pdf
    • http://illinoisprobatesolutions.net/uploads/1/3/0/8/130874422/8a05349ccd.pdf
    • http://sophiesvision.org/uploads/1/3/0/7/130776291/6392461.pdf
    • http://midatlanticloadrite.com/uploads/1/3/0/5/130588556/modifema_pasifodi.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_off0000683c.bin
d66b9171364da86909405056d9060a5e345c9227da775ad0f9ab68127cc4bba2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x683C 8780 bytes

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