Malicious PDF — malware analysis report

Static analysis result for SHA-256 1289d768537fc7f9…

MALICIOUS

PDF

43.2 KB Created: 2020-04-07 03:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b83a01a05f32a7e5e9cdc206cb139336 SHA-1: e2ba668803df4676d7ce80cb3d3ce76ec1f8fc90 SHA-256: 1289d768537fc7f9d663e0626b9368703a6b7e29693379fd0cdcefb6f094d320
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or content distribution scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports this assessment. The document body text is largely unreadable, but the presence of the wkhtmltopdf authoring application suggests it may have been generated programmatically.

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://tardcon.com/uploads/1/3/0/6/130639642/130639642.html#herramientas+para+estimular+la+creatividad+pdf
    • http://sportsman14.com/uploads/1/3/0/9/130969471/5732277.pdf
    • http://ldspodcasts.com/uploads/1/3/0/2/130291371/gilew-zemesipo-guxodamer-gijafozutatibil.pdf
    • http://usacommercialfurniture.com/uploads/1/3/0/2/130272586/likisenelo.pdf
    • http://solaceclinic.com/uploads/1/3/0/8/130814868/3957527.pdf
    • http://snli.co/uploads/1/3/0/2/130289632/8852659.pdf
    • http://qaeconsultingcorp.com/uploads/1/3/0/6/130604249/zomumesebetok_lurunobov_fisigaw_losiza.pdf
    • http://bitpixerssupport.com/uploads/1/3/0/6/130621161/f93195e04.pdf
    • http://mdacconstructioninc.com/uploads/1/3/0/5/130588847/vusozefigoji.pdf
    • http://stvshlds.com/uploads/1/3/0/2/130270985/6353645.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_off00007c5f.bin
8e74ef8bfec77425700a9814413067e35a3df35e361f8ad9e84fc08671e980cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C5F 9660 bytes

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