Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d42ef5164e46d53…

MALICIOUS

PDF

37.1 KB Created: 2020-04-14 08:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2f5554e36bf2c708501d6c938d565a3e SHA-1: 40d0f5bda0b7fb9b8a94c54215b9d6cf185cbdbb SHA-256: 4d42ef5164e46d53366e23a9b044ed90e276f5617daa63d8c6ea47c72234b904
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 External Remote Services T1204 User Execution

The PDF contains a large number of external links, many of which point to other PDF files with numeric slugs, indicating a link farm or SEO spam tactic. The embedded document body text, though partially corrupted, includes a reference to 'learn german podcast' and the wkhtmltopdf generator, suggesting a lure to potentially malicious content hosted on these external sites. The ML classifier strongly flagged this PDF as malicious.

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://timeframingconsulting.com/uploads/1/3/0/2/130289377/130289377.html#learn+german+podcast
    • http://windrosecontabil.com/uploads/1/3/1/4/131406932/voduduxejomebexabul.pdf
    • http://vgplumbing.com/uploads/1/3/0/9/130969639/zesusovimozimotijuj.pdf
    • http://labphotographylab.com/uploads/1/3/0/8/130814868/7412792.pdf
    • http://smithlitsterparticulateprocesses.com/uploads/1/3/1/3/131398386/peketusigubop-duguv.pdf
    • http://moisescastro.com/uploads/1/3/1/4/131411600/84187.pdf
    • http://stillwellonline.com/uploads/1/3/0/6/130621349/kugexeb.pdf
    • http://lynntoma.com/uploads/1/3/0/6/130621352/5652211.pdf
    • http://enconcommercialsandiego.com/uploads/1/3/0/2/130289332/rijinufiwujuxid_givojabig_zagitodif.pdf
    • http://drivingschoolcoventry.mobi/uploads/1/3/0/5/130540540/7517644.pdf
    • http://ella-joy.com/uploads/1/3/1/4/131409794/ripefetelegowopupedo.pdf
    • http://bridgetownbaroque.org/uploads/1/3/0/6/130639945/940715.pdf
    • http://mnproducciones.com/uploads/1/3/0/5/130588591/32193e66.pdf
    • http://howiezowies.org/uploads/1/3/0/4/130488331/3655330.pdf
    • http://ehkhoo.com/uploads/1/3/1/3/131398101/lafatez_pamemitowiz_pixenefapit.pdf
    • http://corinalab.dss.ucdavis.edu/uploads/1/3/0/2/130271067/64e46ab5fc49857.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_off000068b5.bin
79f5f88a705c6b68512a3bb57b7cd6c7bb29321c8cce7b306ab44ac7c6fffed9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B5 7948 bytes

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