Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cd33ba13f1c507…

MALICIOUS

PDF

43.1 KB Created: 2020-04-17 20:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 91a468f6b409d1c88146d4eb862bce60 SHA-1: 2f4e2e726041b45a6333f321dcd96c2201791ab4 SHA-256: 16cd33ba13f1c50717e21983502bba71ffe94dde210dd516916bef8440b7d863
104 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a phishing or scam campaign, likely attempting to direct users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bridportlions.org/uploads/1/3/0/6/130621464/130621464.html#benham+palmistry+pdf
    • http://advanceadvocacyandsupport.com/uploads/1/3/1/6/131607404/nixekajosaduromo.pdf
    • http://art-of-dreams.de/uploads/1/3/0/6/130604306/2904207.pdf
    • http://chantreyjones.com/uploads/1/3/0/7/130775355/8736368.pdf
    • http://hellookb.com/uploads/1/3/0/7/130739928/zemupupa.pdf
    • http://frankyjay.net/uploads/1/3/0/6/130620962/ea20346dc085.pdf
    • http://joesrestaurantguide.com/uploads/1/3/0/5/130589413/9988076.pdf
    • http://butterslideranch.com/uploads/1/3/0/4/130436513/0f90168b5de.pdf
    • http://sclandscapingservices.com/uploads/1/3/0/4/130476866/a4f9ebb5f1885b.pdf
    • http://lamnguen.com/uploads/1/3/1/3/131379503/birinujim_madujejesowu_fevikabalo.pdf
    • http://welloff.media/uploads/1/3/1/0/131070631/kusog.pdf
    • http://verhuurdiemen.nl/uploads/1/3/0/8/130874309/1da1f.pdf
    • http://attimo360virtualtour.com/uploads/1/3/0/8/130873875/tifoxaxazowe.pdf
    • http://amazingsounds-hk.com/uploads/1/3/0/2/130272482/domenumu_munopebiregu_gisojam.pdf
    • http://launicaballantyne.com/uploads/1/3/1/4/131408229/letunafobire_suladumuzofil_penapimisekiga_duwevuz.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_off000082c1.bin
a8bd5828a875c5d2208c971e098da46b95d82ab5c624d1ae725fb0ade5ab1d20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C1 7588 bytes

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