Malicious PDF — malware analysis report

Static analysis result for SHA-256 4510c7982cdd4aa9…

MALICIOUS

PDF

34.3 KB Created: 2020-06-28 04:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2995567464182f8b324198c9092a2cee SHA-1: f8b1025976c6cc8832311288fcebd30454aa99a0 SHA-256: 4510c7982cdd4aa929c4693ac690ab08acd1c8ec1ca23724b33509a975b8d350
96 Risk Score

Malware Insights

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

The PDF document is identified as malicious by an ML classifier with high confidence. It contains a large number of external links, suggesting a link farm or redirection scheme. The document body presents itself as a 'Greenlee 767 repair manual', likely a lure to encourage users to click on the embedded malicious links.

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.lickinflames.com/uploads/1/3/0/3/130323811/130323811.html#greenlee+767+repair+manual
    • http://spiderhawk.org/uploads/1/3/0/8/130874218/5894423.pdf
    • http://brookeoliviarobinson.com/uploads/1/3/0/6/130620695/toratew-tuwuvasef-virosi-lazofulezad.pdf
    • http://hostmaster.mambojambo.it/uploads/1/3/2/6/132681352/zarazopozixujarufew.pdf
    • http://benjamindcrowe.com/uploads/1/3/0/6/130639599/telafa.pdf
    • http://droolcatcher.store/uploads/1/3/1/3/131380511/c35ea.pdf
    • http://files.asntr.org/uploads/1/3/1/8/131857284/9162764.pdf
    • http://daily-engineering.com/uploads/1/3/1/3/131398530/1274807.pdf
    • http://files.thegoblindigest.com/uploads/1/3/1/4/131406437/4af0ceb0bea.pdf
    • http://mx.douglascountyyouthorchestra.org/uploads/1/3/2/7/132710494/xuditeretaz.pdf
    • http://postmaster.nederland-onvervalst-bijzonder.nl/uploads/1/3/1/4/131453799/lapipuve.pdf
    • http://mail.browbeginnings.com/uploads/1/3/0/8/130815381/mofekud.pdf
    • https://gepuwovu.files.wordpress.com/2020/06/14783418001.pdf
    • https://pawojoteloje.files.wordpress.com/2020/06/81095075317.pdf
    • https://telabawogevo.files.wordpress.com/2020/06/65113139133.pdf
    • https://jajonomuluf.files.wordpress.com/2020/06/36839161324.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c28.bin
2d1219d79fee622f401452aa032b1cc2cbacd411f838c3976193d7b5684f25fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C28 4744 bytes
font_01_sfnt_off00005c22.bin
9996dda212b24ae483c5b04715caf46c644b8c15ef86204cba3e81e7b62842db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C22 9932 bytes

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