Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b2f7558f7bf243…

MALICIOUS

PDF

37.1 KB Created: 2020-06-04 15:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dab23bdfcf997bd8fbadc566d3e4ddf2 SHA-1: 529e06b95346016ea81e883ae2109379fc432723 SHA-256: 23b2f7558f7bf243b07343fecf93259de62591e58c068af6d2c2e9d29b751720
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains a URL that points to gibbsmanagementgroup.com, which is likely part of the link farm. This suggests the document is designed to redirect users to potentially malicious websites.

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://gibbsmanagementgroup.com/uploads/1/3/0/5/130589122/130589122.html#androidoyun.club+minecraft+13.1
    • http://kislayapathak.com/uploads/1/3/1/3/131380081/c2fef4876f711.pdf
    • http://mail.flowersofgatlinburg.com/uploads/1/3/0/7/130739127/xebazaroduv.pdf
    • http://mta-sts.peterboroughcohousing.org/uploads/1/3/1/3/131380739/c4bca37d.pdf
    • http://jvbequipment.com/uploads/1/3/1/3/131381374/2727658.pdf
    • http://misscarolsartintheattic.com/uploads/1/3/0/7/130739141/6078555.pdf
    • http://mail.coolbyfans.com/uploads/1/3/0/6/130639535/migenumeruk_ziwovubu_bofigemosovobun_bupukupate.pdf
    • http://stpeagles.com/uploads/1/3/0/2/130289610/e26756021b29f73.pdf
    • http://raphayadh.org/uploads/1/3/1/3/131378972/2481639.pdf
    • http://74-123-75-34.mgwnet.com/uploads/1/3/0/2/130289161/f5afc6d5835e1.pdf
    • http://gibbsmanagementgroup.com/uploads/1/3/0/5/130589122/terms.html
    • http://gibbsmanagementgroup.com/uploads/1/3/0/5/130589122/dmca.html
    • http://gibbsmanagementgroup.com/uploads/1/3/0/5/130589122/policy.html
    • https://novaguni.files.wordpress.com/2020/06/zaromigupo.pdf
    • https://rutaxitulos.files.wordpress.com/2020/06/zinugubabasopaniv.pdf
    • https://nanesufated.files.wordpress.com/2020/06/71945061391.pdf
    • https://xarinupe.files.wordpress.com/2020/06/xupavumofowoxoli.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_off000062c4.bin
46f65b9897eed3bcbda44a57e1b9fb303d6c1071782c4f86a24bc8e22198ce67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C4 11760 bytes

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