Malicious PDF — malware analysis report

Static analysis result for SHA-256 250e832552b0be81…

MALICIOUS

PDF

36.7 KB Created: 2020-05-19 10:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd02cf447f9d305c879c83fa6faed42f SHA-1: 4e070ade38b05526c3f667fb584680ac7d0cd154 SHA-256: 250e832552b0be81c40ecbb0df43965bc8b8fc8d09cc6aa5bae01185b9f42a41
94 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier. It contains a large number of external links, many of which point to PDF files on various domains, suggesting a link farm or redirection strategy. The document body contains garbled text and embedded URLs, further supporting the malicious intent of distributing links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ammanagementllc.com/uploads/1/3/1/6/131607374/131607374.html#clearstream+2max+manual
    • http://oliveirasantos.org/uploads/1/3/0/4/130435514/3129034.pdf
    • http://eliterestaurantmarketing.com/uploads/1/3/0/5/130546153/5805441.pdf
    • http://shrutibhatnagar.com/uploads/1/3/1/6/131637333/vadijosolaka-vemov.pdf
    • http://cassiusmaintenance.com/uploads/1/3/0/4/130478203/186381.pdf
    • http://judith.one/uploads/1/3/1/4/131437725/221409.pdf
    • http://dobbsferryafterschool.com/uploads/1/3/1/1/131164164/jatovifodedakobu.pdf
    • http://saysumgood.com/uploads/1/3/0/5/130539696/vubenose.pdf
    • http://motorpress.com/uploads/1/3/1/4/131454270/5f9a11bb3e.pdf
    • http://trianglebusinessnetworks.com/uploads/1/3/0/4/130435955/zopojutugegolag-tikeke-xegaboziz.pdf
    • http://neurostaff.com/uploads/1/3/1/3/131383767/lupiwexugenen.pdf
    • http://dmdesignwsussex.com/uploads/1/3/0/5/130551536/8779983.pdf
    • http://artoffalcon.net/uploads/1/3/0/9/130969439/xobodofalasutularas.pdf
    • http://divasdominicanhair.net/uploads/1/3/0/3/130312991/2354282.pdf
    • http://pitsfordconsulting.com/uploads/1/3/1/3/131380600/8320827.pdf
    • http://nicoledavis.org/uploads/1/3/0/7/130775328/091fc66ca57648d.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_off00006275.bin
94a14448f8fb0c6734d0382620516356440cde959ce72f861b143f382e4fc190		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6275 10868 bytes

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