Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d4bc43f9c99f43…

MALICIOUS

PDF

42.5 KB Created: 2020-04-20 07:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 79b2f57bee2fb6c7717245ea1528fd70 SHA-1: 7b0e746a1500f567ee5c9352b4fbb89d32c91338 SHA-256: 10d4bc43f9c99f435ba084066cc319867ca2ac27d30953d1b23409f4cb0c03d8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, suggesting it functions as a link farm or a lure for malicious content. The ML classifier strongly indicated maliciousness, and the presence of many external URLs points towards an attempt to redirect users to potentially harmful sites. No scripts were extracted, but the heuristic findings indicate a high likelihood of malicious intent.

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://awesomesandiegocleaning.com/uploads/1/3/1/4/131483778/131483778.html#curriculum+vitae+template+free+doc
    • http://sneekerpimps.ca/uploads/1/3/0/2/130274241/zolebajuludasivetini.pdf
    • http://elevehomesbaguio.com/uploads/1/3/0/5/130588614/17e14d78bd25.pdf
    • http://coolcreativecreations.com/uploads/1/3/0/8/130874305/fidekeb_reguk_wurazar_wuguwaxu.pdf
    • http://kmwhittemore.com/uploads/1/3/0/6/130639965/5266219.pdf
    • http://brinkleyhardware.com/uploads/1/3/0/4/130488294/wuvuxuxi.pdf
    • http://tyliddell.com/uploads/1/3/1/3/131384232/sogovevupegid_tixorafati_sazowifo_negomemosivi.pdf
    • http://kathydehoffphotography.com/uploads/1/3/0/4/130476410/zokitofalasizatujuka.pdf
    • http://lakeconroecontractors.com/uploads/1/3/0/4/130488345/tamidudifug_vufebi_labifuguneniveb_wuzesusobogi.pdf
    • http://jennyharpersclassroom.com/uploads/1/3/1/4/131406455/840a9.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_off00007ec8.bin
a68b0f0e6a20efcc5dc283997d1ef076642bff4936151f87802213818bfeeaa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC8 8252 bytes

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