Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92abdd339684dbd…

MALICIOUS

PDF

36.2 KB Created: 2020-05-30 17:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d94be0002302e911819ef09730cd12ce SHA-1: 6c8f66b243be0c5d0e874aae791103a06ef91792 SHA-256: f92abdd339684dbdc2961d79c2529b713a051981cd7119e3ba98aedd8ca0708b
94 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier with high confidence and contains a significant number of external links to other PDF documents. This suggests a link farm or distribution mechanism for further malicious content. The document body contains garbled text and references to wkhtmltopdf, indicating it was likely generated programmatically rather than being a user-facing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://alwaysfuntravel.voyagerwebsites.com/uploads/1/3/1/4/131453151/131453151.html#herbarz+polski+tadeusz+gajl+pdf
    • http://host67-131-77-213.static.ahcnm.org/uploads/1/3/1/4/131408664/1daf2eaba39a5c2.pdf
    • http://dominguezexpress.com/uploads/1/3/0/6/130639374/neruwupawa.pdf
    • http://richfitpro.com/uploads/1/3/0/5/130543855/niveviwimi.pdf
    • http://burlapdiamonds.com/uploads/1/3/1/3/131398576/7824865.pdf
    • http://outreachbaptistchurchknoxville.com/uploads/1/3/0/5/130539085/vepuxigoboxer.pdf
    • http://segarraproductioninsuranceservices.com/uploads/1/3/0/6/130621214/dakolidoxevogafalipo.pdf
    • http://thebookthateveryoneshouldhave.com/uploads/1/3/0/9/130969414/8181679.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_off000060d3.bin
2b681938a95702843f2426a98ecabef17469d18aea0ae3497ec6181d9d556ee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D3 11160 bytes

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