Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c15a0199921e4a…

MALICIOUS

PDF

35.1 KB Created: 2020-04-14 10:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0add9b33a3f7451b2b05e518fdc0bab6 SHA-1: 063344e5591b19effecb0e19c2ebaa7b33787a9e SHA-256: c4c15a0199921e4a650252567563d2ba1de683b4eba164c4753be3899772eec4
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a significant number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm for SEO manipulation or malware distribution. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'free crm xls template', suggesting a lure to entice users to click on the embedded malicious links.

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://monaconsultingservices.com/uploads/1/3/0/9/130969293/130969293.html#free+crm+xls+template
    • http://chewysuz.com/uploads/1/3/0/8/130813866/borovufivapikejebo.pdf
    • http://rlconsultingservices.com/uploads/1/3/0/4/130478551/2756186.pdf
    • http://empower-worldwide.com/uploads/1/3/0/9/130969628/6800548.pdf
    • http://4-hwesternheritage.org/uploads/1/3/0/7/130739879/d7f1d8448c5b48.pdf
    • http://stealmybookshelf.com/uploads/1/3/0/5/130538990/2774033.pdf
    • http://carolinawellness.center/uploads/1/3/1/3/131380589/lovumuges.pdf
    • http://trekkerapp.net/uploads/1/3/1/3/131380889/1009012.pdf
    • http://nikhilkhedekar.com/uploads/1/3/0/2/130272853/kogodobe.pdf
    • http://outsidethebeautybox.com/uploads/1/3/0/6/130605165/8923931.pdf
    • http://rumadesignstudio.com/uploads/1/3/0/7/130776866/9336879.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_off0000611c.bin
bac313aed21e7e7560e4c1ced78356fb217ea6756c8c3500e1981a0e22ab25df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x611C 8120 bytes

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